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Tropics

The Tropics, or tropical zone, refers to the band of latitudes on Earth centered on the equator and bounded by the Tropic of Cancer at approximately 23.5° N and the Tropic of Capricorn at 23.5° S, where the Sun passes directly overhead at least once annually due to the planet's axial tilt.^[1]^[2] This geographic definition encompasses about 40% of Earth's surface, characterized by high solar insolation year-round that drives intense atmospheric convection and minimal temperature seasonality.^[3] Tropical climates feature average temperatures exceeding 20°C with the coolest month above 18°C, fostering wet and dry variants influenced by the Inter-Tropical Convergence Zone and monsoonal patterns, which deliver substantial annual precipitation in many areas—often over 2,000 mm.^[4]^[3] These conditions, rooted in the geometry of Earth's orbit and rotation, enable rapid evaporation and high humidity, supporting ecosystems like rainforests that exhibit the highest net primary productivity among terrestrial biomes.^[5] Ecologically, the Tropics host over half of global terrestrial vertebrate species and a disproportionate share of total biodiversity, with stable warmth and resource abundance permitting evolutionary specialization and high species density unmatched at higher latitudes.^[6] This latitudinal gradient in diversity arises from factors including extended geological stability and energetic constraints on speciation, rather than simplistic energy availability alone.^[7] Human impacts, such as deforestation, now threaten these hotspots, underscoring the region's outsized role in planetary carbon cycling and ecological resilience.^[8]

Etymology and Conceptual History

Origins of the Term

The term tropics originates from the Late Latin tropicus, borrowed from Ancient Greek tropikos (τροπικός), an adjective meaning "pertaining to a turning" or "of the solstice," derived from tropē (τροπή), "a turning, change of direction, or solstitial point," ultimately from the verb trepein (τρέπω), "to turn."^[9]^[10] This etymology reflects the astronomical observation of the sun's apparent annual path reversing direction at the solstices, as viewed from Earth, rather than any climatic connotation.^[9] In ancient Greek astronomy, the concept denoted the parallel circles of celestial latitude where the sun achieves its maximum declination north (Tropic of Cancer, or *Tropikos Καρκίνος) or south (Tropic of Capricorn, or *Tropikos Αιγόκερως) during the summer and winter solstices, respectively, marking the "turning points" of the sun's northward or southward progression.^[9]^[11] These lines were formalized in Hellenistic texts, such as those by astronomers like Hipparchus (c. 190–120 BCE), who calculated solar declinations to approximately 24° from the equator, though the term's application to terrestrial geography emphasized the solstitial zenith passages.^[12] The plural form tropics entered Middle English around the late 14th century via Medieval Latin, initially referring specifically to these two solstitial parallels as astronomical boundaries.^[9] By the 1520s, its usage expanded to describe the equatorial zone between the Tropic of Cancer (approximately 23.5° N) and Tropic of Capricorn (approximately 23.5° S), where the sun passes directly overhead twice annually, distinguishing it from temperate and polar regions based on solar geometry rather than temperature alone.^[9] Early English texts, such as those in the Oxford English Dictionary's historical corpus, equated "tropical" signs with zodiacal points like Aries, Libra, Cancer, and Capricorn where the sun "turns back," underscoring the term's root in observable celestial mechanics.^[13]

Historical Perceptions and Theories

In ancient Greek cosmology, the division of Earth into climatic zones emerged around the 6th century BCE, with philosopher Parmenides proposing five parallel bands: a central torrid zone between the tropics, flanked by two temperate zones and two frigid polar regions.^[14] This framework, building on Pythagoras's spherical Earth model, attributed the torrid zone's uninhabitability to excessive solar heat from the sun's perpetual overhead position, rendering it a barren, scorching expanse unfit for human life.^[15] Aristotle, in the 4th century BCE, refined this into three primary zones—torrid (equatorial), temperate (mid-latitudes), and frigid (polar)—emphasizing the torrid region's extreme aridity and heat due to direct, year-round solar rays perpendicular to the surface, which he contrasted with the oblique angles in higher latitudes that moderated temperatures.^[16] ^[17] He posited that this intense insolation evaporated moisture and scorched the land, preventing agriculture and settlement, a view echoed in later Hellenistic texts portraying the zone as a realm of mythical horrors like serpentine men and viper-eating troglodytes.^[18] Such perceptions stemmed from limited empirical observation, as Greek explorers like Herodotus described distant tropical-like areas (e.g., India) as oppressively hot due to a flat-Earth assumption and rising sun's proximity to watery horizons, rather than rigorous latitudinal analysis.^[15] By the Roman era and into medieval Islamic scholarship, these theories persisted, with Ptolemy's 2nd-century CE Geography mapping the torrid zone as impassable, its heat allegedly liquefying humors and fostering degeneracy, influencing climatic determinism where environment shaped human temperament—tropical dwellers seen as indolent or irrational from enervating warmth.^[19] European Age of Exploration from the 15th century challenged this, as voyages by Columbus (1492) and Magellan (1519–1522) revealed populous, viable societies in the Americas and Pacific, disproving blanket uninhabitability and prompting revisions like those in 16th-century texts acknowledging equatorial habitability despite monsoonal deluges and fevers, though myths of tropical torpor lingered in colonial rationales for European superiority.^[20] Enlightenment-era theories shifted toward mechanistic explanations, with Montesquieu's 1748 The Spirit of the Laws invoking heat's causal role in diluting societal vigor, yet empirical data from naturalists like Alexander von Humboldt (late 18th–early 19th century) quantified solar forcing via isolines of temperature and vegetation, laying groundwork for modern bioclimatic models while debunking deterministic extremes through altitudinal and oceanic variations within the tropics.^[19] These historical views, often biased by ethnocentric temperateness as normative, underscore a transition from speculative zonation to observationally grounded causal realism in understanding tropical dynamics.^[21]

Definitions and Boundaries

Astronomical Definition

The astronomical definition of the tropics delineates the latitudinal band on Earth where the Sun reaches a zenith position—directly overhead at noon—at least once during the year. This zone is bounded by the Tropic of Cancer, approximately 23.44° north of the Equator, and the Tropic of Capricorn, approximately 23.44° south of the Equator. These boundaries correspond precisely to the current obliquity of the ecliptic, the tilt of Earth's rotational axis relative to its orbital plane, which stands at 23.436° as of late 2025.^[22] ^[23] The Tropic of Cancer marks the northern limit where the Sun is zenithal on the June solstice, while the Tropic of Capricorn indicates the southern limit for the December solstice, reflecting the seasonal extremes of solar declination driven by axial tilt.^[1] This definition stems from celestial mechanics: the tropics encompass all latitudes experiencing subsolar points, where incoming solar rays are perpendicular to the surface. Axial precession, with a cycle of about 26,000 years, shifts the timing of solstices relative to Earth's orbit but does not alter the latitudinal boundaries, which are governed solely by obliquity.^[23] Over millennial timescales, obliquity oscillates between 22.1° and 24.5° in a 41,000-year cycle due to gravitational perturbations from the Sun, Moon, and planets, thereby causing gradual northward or southward migration of the tropical parallels by up to 1.2° from present values.^[24] Such variations influence the geographic extent of perpetual midday zenith solar positions but remain imperceptible on human timescales.^[23]

Climatic and Ecological Definitions

Climatic definitions of the tropics emphasize temperature consistency that eliminates frost risk and enables year-round growth. The predominant criterion, established in the Köppen-Geiger system, designates tropical climates as those in which the mean temperature of the coldest month is at least 18°C (64°F), with all months meeting or exceeding this threshold.^[4]^[25] This standard arises from empirical observations of vegetation limits, as temperatures below 18°C typically induce dormancy or damage in tropical-adapted species.^[26] Within this framework, subtypes such as tropical rainforest (Af), monsoon (Am), and savanna (Aw/As) are further distinguished by annual precipitation exceeding potential evapotranspiration, with dry seasons defined by months receiving less than 60 mm of rain.^[4] These climatic boundaries often extend beyond the astronomical tropics of Cancer and Capricorn, incorporating subtropical margins where persistent warmth prevails, such as parts of northern Australia or southern Florida, based on long-term meteorological data from 1991–2020.^[25] Precipitation regimes play a secondary role, with wet tropics requiring over 2000 mm annually to sustain dense vegetation, while drier variants support grasslands amid seasonal droughts.^[4] Ecologically, the tropics are characterized by biomes featuring evergreen broadleaf forests, mangroves, and savannas that exploit constant solar energy for high net primary productivity, often exceeding 2000 g/m²/year in rainforests.^[7] These ecosystems exhibit peak global biodiversity, with species richness gradients increasing toward the equator due to stable conditions minimizing extinction and maximizing speciation opportunities over geological timescales.^[7]^[27] Boundaries are functionally set by physiological tolerances of dominant flora and fauna to minimal temperature fluctuations and absence of killing frosts, aligning closely with climatic zones but varying with topography and soil—highland areas like the Andes may host temperate enclaves within latitudinal tropics.^[26] Causal drivers include elevated insolation and humidity fostering complex food webs and niche partitioning, though human alterations like deforestation can shift effective ecological limits.^[7]

Variations and Overlaps

The astronomical definition of the tropics, bounded by the Tropics of Cancer and Capricorn at approximately 23.44° north and south latitudes, relies on solar geometry where the sun passes directly overhead at least once annually.^[1] In contrast, climatic definitions emphasize thermal thresholds, such as the Köppen-Geiger classification's group A climates, where the mean temperature of the coldest month exceeds 18°C (64°F), leading to a zone that roughly aligns with but deviates from the astronomical band due to local factors like ocean currents and elevation.^[28] ^[4] Ecological definitions further vary by focusing on biome suitability, such as the prevalence of broadleaf evergreen forests requiring consistent warmth and moisture, which can contract the effective tropical zone equatorward in drier or elevated interiors while expanding it in coastal margins.^[29] These variations result in mismatches; for instance, high-altitude plateaus within the astronomical tropics, like parts of the Andes above 2,000 meters, exhibit temperate or even alpine conditions with average coldest-month temperatures below 18°C, disqualifying them from climatic tropical status despite their latitude.^[25] Conversely, low-elevation coastal areas poleward of 23.44°, such as southern Florida (around 25–26°N) or Hawaii's leeward coasts, sustain tropical savanna or monsoon climates (Köppen Aw/Am) due to maritime moderation preventing frost, extending the climatic tropics beyond astronomical limits by 1–3 degrees of latitude in select locales.^[28] Ecological overlaps amplify this, as tropical flora like mangroves or certain palms can thrive in subtropical fringes with adequate rainfall, blurring boundaries in regions like the northern Australian wet-dry tropics transitioning to subtropical eucalypt woodlands. Overlaps with subtropics are particularly pronounced in transitional latitudes (roughly 23–35°), where definitions intersect: humid subtropical climates (Köppen Cfa/Cwa) feature hot summers akin to tropics but winters cool enough for occasional frosts (below 0°C no more than once per decade on average), yet share ecological traits like semi-evergreen vegetation in moist variants.^[25] These zones, often termed "marginal tropics," exhibit hybrid characteristics, such as the Mediterranean-influenced subtropics of southern California or the monsoon subtropics of southeastern China, where tropical cyclones influence weather patterns similar to core tropics.^[4] Such overlaps challenge rigid boundaries, with empirical data from 1991–2020 Köppen updates showing climatic tropical extents shifting poleward by up to 0.5° per decade in some ocean-adjacent areas due to warming trends, potentially widening discrepancies with the static astronomical frame.^[28] ![Köppen-Geiger climate classification map (1991–2020), illustrating climatic tropical zones (A) relative to astronomical boundaries][center]^[28]

Physical Characteristics

Geographical Extent

The tropics comprise the latitudinal band extending from the Tropic of Cancer at 23°26′ N to the Tropic of Capricorn at 23°26′ S, encompassing regions where the Sun passes directly overhead at least once during the year.^[30] This demarcation arises from Earth's axial tilt of approximately 23.44 degrees relative to its orbital plane, positioning these parallels as the northernmost and southernmost latitudes receiving perpendicular solar rays on the summer solstices.^[31] The total span covers about 47 degrees of latitude, representing roughly 40 percent of Earth's surface area.^[32] This zone includes significant portions of all continents except Antarctica, with land accounting for 36 percent of global terrestrial surface within the tropics.^[33] Major landmasses encompassed include central and northern South America, sub-Saharan Africa, Southeast Asia, northern Australia, and Pacific island groups, alongside vast oceanic expanses such as the equatorial Atlantic, Pacific, and Indian Oceans. The boundaries' precise positions vary slightly over millennia due to changes in Earth's obliquity, which oscillates between 22.1 and 24.5 degrees over a 41,000-year cycle, though the current value has remained stable near 23.4 degrees for recent centuries.^[32]

Topography and Geology

The topography of the tropics spans elevations from sea level to over 6,000 meters, encompassing vast sedimentary basins, rugged orogenic belts, rift valleys, and insular archipelagos. Lowland regions, such as the Amazon and Congo basins, cover millions of square kilometers of relatively flat terrain dissected by meandering rivers and subject to periodic flooding, underlain by thick Cenozoic sedimentary deposits atop Precambrian basement.^[34] In contrast, high-relief areas include the Tropical Andes, where peaks like Chimborazo in Ecuador exceed 6,200 meters, formed through ongoing compressional tectonics.^[35] Geologically, tropical continental cores are dominated by ancient Precambrian cratons, including the Congo Craton in Africa and the Amazonian Craton in South America, which stabilized between 2.5 and 1.0 billion years ago and exhibit low seismic activity due to their rigid lithospheric roots extending over 200 km deep. These cratons form the stable platforms for peripheral mobile belts where Phanerozoic orogenies have added younger terrains. Active plate boundaries within tropical latitudes drive deformation, as seen in the Andes, resulting from the subduction of the Nazca Plate beneath South America at rates of 6-10 cm per year, producing fold-thrust belts, magmatic arcs, and associated mineral deposits.^[35] The East African Rift System exemplifies extensional tectonics in the tropics, a 3,000-km-long Cenozoic feature involving lithospheric thinning, normal faulting, and alkaline volcanism, with half-graben basins filled by alluvial and lacustrine sediments.^[36] ^[37] In oceanic and marginal settings, subduction-related volcanic arcs, such as the Sunda Arc in Indonesia, generate chains of stratovolcanoes and associated geothermal activity, contributing to island formation and high weathering rates in humid environments.^[38] Coastal tropics feature biogenic landforms like fringing coral reefs and atolls, constructed on subsided volcanic pedestals through carbonate accumulation over millions of years.^[39] This geological diversity underlies the region's ecological complexity and resource endowments, including hydrocarbons in basins and metals in orogenic zones.

Climate Patterns

Temperature and Seasons

The tropical regions exhibit consistently high temperatures throughout the year, with monthly averages typically ranging from 25°C to 28°C (77°F to 82°F), due to the near-overhead position of the sun at least once annually within the latitudes of 23.5°N to 23.5°S.^[33] This results from Earth's axial tilt of approximately 23.5°, which ensures that solar insolation remains intense and relatively uniform across seasons, as the sun's zenith path stays close to equatorial overhead positions rather than shifting dramatically as in higher latitudes.^[1] In contrast to temperate zones, where annual temperature swings can exceed 20°C, tropical areas experience minimal seasonal variation, often less than 5°C between the warmest and coolest months, with all months maintaining means above 18°C.^[1]^[40] Diurnal temperature fluctuations dominate over annual cycles in the tropics, with daytime highs frequently reaching 30°C to 35°C (86°F to 95°F) under clear skies, while nighttime lows rarely drop below 22°C (72°F) due to atmospheric moisture and cloud cover limiting radiative cooling.^[3] Empirical data from tropical stations, such as those in wet climates like rainforests, confirm average ranges of 21°C to 30°C (70°F to 86°F) year-round, with cloudiness during wet periods further stabilizing temperatures by absorbing and re-emitting longwave radiation.^[41] In drier tropical subtypes, such as savanna regions, maximum temperatures can peak above 35°C during dry seasons when reduced cloud cover allows greater solar heating, but even here, the annual range remains subdued compared to extratropical areas.^[42] Seasons in the tropics are primarily distinguished not by temperature contrasts but by shifts in precipitation driven by the migration of the Intertropical Convergence Zone (ITCZ), leading to wet and dry periods rather than hot and cold ones.^[3] For instance, in Northern Hemisphere tropics, wet seasons align with May to July ITCZ positioning, during which increased cloudiness moderates daytime highs by 2–3°C relative to drier months, while Southern Hemisphere wet periods occur from November to February.^[43] This precipitation-driven seasonality results in slight thermal enhancements during dry phases—up to 1–2°C warmer on average—owing to lower humidity and clearer skies, but overall, the thermal regime remains equable, with the sun's consistent high-angle input overriding tilt-induced variations.^[1] Such patterns underscore the tropics' role as a heat reservoir, exporting energy poleward via atmospheric circulation to balance global imbalances.^[44]

Precipitation Regimes

The precipitation regimes of the tropics are dominated by convective processes arising from the consistent high insolation, which promotes evaporation from abundant surface water and vegetation, leading to atmospheric instability and frequent thunderstorms. Annual precipitation totals in tropical regions often exceed 1,500 mm, with two-thirds of global rainfall concentrated between 23.5°S and 23.5°N due to the low-latitude energy surplus driving upward motion.^[45] This contrasts with higher latitudes, where subsidence limits rainfall; causal mechanisms include the release of latent heat from condensation, which reinforces vertical circulation cells like the Hadley cells.^[46] Central to these regimes is the Intertropical Convergence Zone (ITCZ), a narrow band of enhanced convection where opposing trade winds meet, producing a zonal maximum in precipitation that migrates seasonally with the solar declination—typically 5–10° north of the equator in boreal summer and south in austral summer. In the Northern Hemisphere, this shift brings wet seasons from May to July, while in the Southern Hemisphere, they occur from November to February, with daily rainfall rates often surpassing 10 mm in active phases due to organized mesoscale systems.^[43] ^[47] Equatorial zones experience near-constant ITCZ influence, yielding bimodal or aseasonal patterns with minimal monthly variation (rarely below 60 mm), as in parts of the Amazon basin where wet-season peaks exceed 200 mm monthly from December to May.^[48] Monsoonal circulations represent an extension of ITCZ dynamics, featuring seasonal wind reversals driven by differential land-sea heating: summer flows draw moist maritime air inland, concentrating 70–90% of annual rainfall in 3–4 months, as observed in the Asian monsoon domain where totals reach 2,000–5,000 mm. These regimes differ from pure ITCZ-driven ones by stronger orographic enhancement over continental interiors and coastlines.^[46] ^[49] In savanna-like margins, prolonged dry seasons emerge where the ITCZ withdraws fully, with precipitation dropping below 60 mm for several months, enabling grass-dominated ecosystems but heightening drought risk; for instance, northern Australian savannas receive 800–1,500 mm annually, skewed toward summer.^[50] Spatial variations reflect topography and ocean currents: windward coastal slopes intercept trade-wind moisture, amplifying orographic rainfall up to 10,000 mm yearly in Hawaiian peaks, while rain shadows produce drier pockets. Observational data from satellite gauges confirm these patterns, with zonal means peaking at 6–8 mm/day near 10° latitude during solstices, modulated by phenomena like El Niño, which shifts the ITCZ southward and suppresses eastern Pacific rainfall by 20–50%.^[51] Empirical reconstructions underscore the ITCZ's paleo-position as a proxy for hemispheric energy balance, with southward biases during cooler Northern Hemisphere periods.^[52]

Extreme Weather Events

The tropics experience a disproportionate share of tropical cyclones, which derive their energy from sea surface temperatures consistently above 26.5°C, enabling rapid intensification in regions of low vertical wind shear. Globally, an average of 80 to 90 tropical storms form each year, with approximately 40 to 50 reaching hurricane-strength winds of at least 119 km/h, predominantly in tropical basins such as the Atlantic, eastern Pacific, and western Pacific.^[53] ^[54] In 2022, 88 named storms occurred worldwide, near the 1991-2020 climatological average, while 2024 saw 86 such systems, also aligning closely with norms.^[55]^[56] Tropical cyclone intensity, measured by sustained wind speeds and central pressure, peaks in Category 5 storms with winds over 252 km/h, capable of devastating coastal infrastructure and agriculture through storm surge, high winds, and torrential rainfall exceeding 500 mm in 24 hours. Observational records indicate no upward trend in the frequency of intense (Category 3+) Atlantic hurricanes over the past five decades, though model projections suggest a potential 1-10% increase in global peak intensities under 2°C warming scenarios driven by thermodynamic effects on ocean heat content.^[57]^[58] These events account for substantial economic losses; for example, U.S. billion-dollar disasters from 1980-2024 include numerous tropical cyclone impacts, with cumulative costs adjusted to 2024 dollars surpassing hundreds of billions.^[59] Beyond cyclones, monsoon regimes produce extreme precipitation events leading to pluvial floods, where seasonal shifts in the Intertropical Convergence Zone deliver over 1,000 mm of rain in weeks, overwhelming river systems in regions like Southeast Asia and West Africa. Compound events, such as cyclones coinciding with monsoons, exacerbate flooding, as documented in IPCC assessments of regional extremes.^[60] Tropical droughts, often linked to anomalous warming like El Niño, have intensified in variability, with events in the 2010s amplifying atmospheric CO2 growth rates through reduced vegetation uptake.^[61] Heatwaves in the tropics, while less sharply defined than in extratropical zones due to perennial high temperatures, compound with droughts to elevate river water quality degradation and ecosystem stress globally, with empirical analyses showing worsened conditions for most constituents during such episodes. Flash droughts paired with extreme heat exhibit 6.7-90.8% higher severity and prolonged recovery times compared to isolated events.^[62]^[63] These phenomena underscore the tropics' vulnerability to interconnected extremes, where ocean-atmosphere interactions drive both intensification and spatial clustering.^[60]

Ecosystems and Biodiversity

Major Biomes and Habitats

The tropics encompass a range of biomes shaped primarily by consistent high temperatures above 18°C year-round and precipitation regimes that vary from perpetually wet to strongly seasonal, fostering habitats from closed-canopy forests to open woodlands. These biomes, including tropical rainforests, dry forests, savannas, and coastal mangroves, support disproportionate global biodiversity despite covering roughly 40% of Earth's land surface between the Tropics of Cancer and Capricorn. ^[64] ^[65] Tropical rainforests, the most iconic tropical biome, occur in equatorial zones with annual rainfall exceeding 1,800–2,500 mm and no month drier than 60 mm, resulting in multilayered canopies of broad-leaved evergreen trees up to 50 meters tall, nutrient-poor soils reliant on rapid nutrient cycling via leaf litter, and exceptional species richness—potentially 50% of terrestrial species in just 6–7% of land area. Concentrated in the Amazon Basin (covering about 5.5 million km²), Congo Basin (1.8 million km²), and Indo-Malayan regions, these forests feature high humidity, limited seasonality, and adaptations like buttress roots and epiphytes to maximize light capture in shaded understories. ^[66] ^[67] ^[68] Tropical dry forests, transitional between rainforests and savannas, prevail in regions 10°–25° latitude with pronounced dry seasons (3–6 months of low rainfall below 100 mm/month) and total annual precipitation of 750–1,500 mm, supporting deciduous trees that shed leaves to conserve water, thorny shrubs, and grasses on more fertile, leached soils. Distributed across fragmented patches in Mexico (harboring the largest extent), Brazil, Bolivia, India, and Madagascar, this biome spans approximately 519,597 km² in the Americas alone, with global coverage estimated at 40–50% of all tropical forests but facing higher deforestation rates due to agriculture. ^[69] ^[70] ^[71] Tropical savannas, or wet-dry grasslands, dominate in areas 8°–20° from the equator with 500–1,500 mm annual rainfall concentrated in a 4–6 month wet season followed by drought, yielding landscapes of continuous tall grasses (up to 3–4 meters) interspersed with fire-resistant trees like acacias and baobabs, adapted to frequent wildfires and herbivory that prevent forest encroachment. Extensive in Africa (e.g., Serengeti covering 1 million km²), northern Australia, and South America's Llanos, savannas exhibit nutrient-rich soils from grass decomposition but vulnerability to overgrazing and climate shifts. ^[72] ^[73] ^[74] Mangrove habitats fringe tropical coastlines in intertidal zones of brackish to saline waters, featuring salt-excreting trees and shrubs (e.g., Rhizophora species) with prop roots for stability in soft sediments, annual rainfall often exceeding 1,000 mm, and temperatures above 20°C. Occurring in over 123 countries along sheltered estuaries and deltas, mangroves cover about 137,000–152,000 km² globally, providing critical nurseries for fisheries (supporting 75% of commercial tropical fish), carbon sequestration (up to 4 times higher than terrestrial forests per area), and coastal protection against erosion and storms. ^[75] ^[76] ^[77]

Floral Diversity

Tropical regions encompass a disproportionate share of global floral diversity, hosting the majority of the estimated 500,000 land plant species worldwide, with concentrations driven by consistently warm temperatures, ample sunlight, and high precipitation that enable specialized adaptations and speciation.^[78] Tropical rainforests, in particular, account for approximately 50% of terrestrial plant species despite covering only about 6% of Earth's land surface, fostering environments where up to 400 tree species can coexist in a single hectare.^[79] This richness arises from ecological stability over geological timescales, allowing for niche partitioning among vascular plants, including angiosperms, gymnosperms, ferns, and bryophytes, with Latin America exhibiting over twice the vascular plant species of sub-Saharan Africa in a comparable area.^[80] Prominent plant families underscore this diversity, such as Orchidaceae, with tens of thousands of species predominantly in tropical habitats, exemplifying epiphytic and pollinator-specific adaptations; Arecaceae (palms), ubiquitous across tropical rainforests for structural dominance in understories and canopies; and Fabaceae, contributing nitrogen-fixing legumes vital to soil fertility in nutrient-poor tropical soils.^[81]^[82] In the Amazon basin, verified checklists reveal over 7,000 species of shrubs, small trees, lianas, vines, and herbs alone, comprising more than half of regional seed plant diversity and highlighting understory contributions to overall floristics.^[83] Endemism rates are elevated, particularly in montane tropics like the Tropical Andes, where 50-60% of plant species are unique to the region, reflecting isolation and varied microclimates that promote divergence.^[84] Floral composition varies by biome, with lowland rainforests showing higher endemicity (up to 85% shared species pools) compared to montane forests, where elevation gradients introduce cooler-adapted flora.^[85] Across closed-canopy tropical forests, just 1,053 species account for half of the estimated 800 billion trees, indicating oligarchic dominance by common genera amid vast rare-species pools that sustain resilience but face threats from habitat fragmentation.^[86] These patterns, documented through georeferenced databases like RAINBIO for Africa (22,577 species across growth forms), affirm tropics as primary repositories of plant evolutionary innovation, though systematic under-sampling in remote areas suggests actual diversity may exceed current estimates.^[87]

Faunal Adaptations and Endemism

Tropical fauna exhibit specialized adaptations to the consistent warmth, high humidity, and abundant rainfall characteristic of the region, which foster dense vegetation and intense interspecies competition. Many animals, such as arboreal primates and insects, have evolved prehensile tails or adhesive pads for navigating complex canopy structures, enabling efficient movement and foraging in vertically stratified habitats.^[88] Dietary niche partitioning is prevalent, with species like certain fruit bats specializing in pollen or nectar to reduce competition in resource-rich but contested environments.^[88] In response to elevated predation pressures from diverse carnivores and parasites, adaptations include cryptic camouflage, as seen in sloths whose algae-covered fur blends with mossy branches, and slow metabolic rates that minimize detection and energy needs.^[89] Toxin sequestration in amphibians like poison dart frogs deters predators, leveraging the tropics' chemical diversity from plants and microbes.^[90] High biodiversity drives further defenses, such as Müllerian mimicry among unpalatable insects, where convergent warning colorations signal toxicity to shared predators, enhancing survival in predator-saturated ecosystems.^[5] Reproductive strategies emphasize quantity over parental investment, with species like tropical fish and invertebrates producing thousands of eggs annually to offset high juvenile mortality from density-dependent factors.^[91] Enhanced sensory adaptations, including expanded neck vertebrae in sloths allowing 270-degree head rotation, facilitate vigilance in omnidirectional threat environments.^[89] Endemism in tropical fauna is pronounced, with stable climatic conditions over millennia promoting speciation and limiting dispersal, particularly in isolated refugia like montane forests and islands. The Tropical Andes alone host over 670 endemic amphibian species, representing more than two-thirds of the region's total, due to topographic barriers fostering allopatric divergence.^[84] Globally, tropical islands exhibit endemism rates up to 9.5 times higher than continental areas for vertebrates, driven by vicariance and founder effects.^[92] In Southeast Asian tropics, approximately 50,000 animal species occur, with ongoing discoveries averaging 364 per year, many confined to archipelago endemism hotspots.^[93] These patterns underscore the tropics' role as evolutionary cradles, though habitat fragmentation exacerbates vulnerability for narrow-range endemics.^[94]

Human Interactions and Impacts

Population Distribution and Urbanization

Approximately 40% of the world's population resides within the tropical zone, encompassing over 3 billion people as of 2022, with projections indicating that more than half of global inhabitants will live there by 2050 due to sustained high fertility rates and net migration patterns.^[95] ^[96] Population densities vary significantly, reaching highs in humid subtropical and tropical wet zones—often exceeding those in arid or polar regions—owing to fertile alluvial plains, river basins like the Amazon and Ganges, and coastal lowlands that support intensive agriculture and fisheries.^[97] In contrast, densities remain low in inland equatorial rainforests and mountainous interiors due to challenging terrain, poor soil accessibility, and limited infrastructure.^[98] Urbanization in tropical regions lags behind the global average but has accelerated markedly, with the proportion of tropical residents in urban areas rising from 30% in 1980 to 47% by 2018, compared to the worldwide rate of approximately 56% in recent years.^[99] ^[26] This growth stems primarily from rural-to-urban migration driven by employment opportunities in nascent manufacturing, services, and informal sectors, alongside natural population increases outpacing rural land capacity; empirical studies in Southeast Asia and sub-Saharan Africa document annual urban expansion rates of 3-5% in major centers.^[100] Countries with significant tropical land coverage, such as Indonesia and Brazil, saw urban populations reach 39% of their totals by 2015, fueling the emergence of megacities like Jakarta (over 10 million inhabitants) and Lagos (around 15 million).^[26] Tropical urbanization manifests unevenly, with over 80% of new urban dwellers settling in low- to middle-income areas prone to informal housing and inadequate services, as coastal and riverine sites attract density due to trade access despite flood vulnerabilities.^[101] In Africa, urban growth rates have outpaced all continents since the 1970s, reaching 4-5% annually in tropical nations, propelled by agricultural mechanization displacing rural labor and limited policy interventions to retain countryside populations.^[100] This pattern underscores a causal link between demographic pressures and geographic pull factors, though institutional factors like governance quality influence settlement quality more than climate alone.^[26]

Agriculture, Resources, and Land Use

Tropical agriculture primarily consists of subsistence farming and cash crop plantations, with key staples including cassava, rice, bananas, and yams, alongside export-oriented commodities such as oil palm, cocoa, coffee, and rubber.^[102] In 2023, global production of primary crops, many of which are tropical, reached 9.9 billion tonnes, reflecting a 27 percent increase since 2010, though tropical yields often lag due to environmental constraints.^[103] The Americas dominate in sugarcane (51 percent of world total) and maize (50 percent) production as of 2022, both integral to tropical systems.^[104] Tropical soils, typically highly weathered and nutrient-poor with low organic matter and high acidity, pose significant fertility challenges, necessitating practices like shifting cultivation to allow fallow periods for nutrient replenishment through natural regeneration.^[105] Shifting cultivation, involving forest clearing, short-term cropping, and extended fallows, maintains soil quality in low-intensity systems but degrades it when fallow lengths shorten due to population pressure, reducing carbon and nutrient stocks.^[106] ^[107] Intensification efforts, such as agroforestry or fertilizers, aim to sustain productivity, yet empirical data show variable success amid pest pressures and erratic rainfall.^[108] Natural resources in tropical regions include abundant timber from rainforests, substantial oil and natural gas reserves (e.g., in Indonesia and Nigeria), and diverse minerals such as gold, cobalt, and iron ore concentrated in Africa and South America.^[109] ^[110] Timber extraction supplies global markets but often precedes agricultural conversion, while mineral and hydrocarbon mining disrupts ecosystems, with unsustainable practices exacerbating habitat loss.^[111] Land use in the tropics is dominated by agricultural expansion, which drives over 90 percent of deforestation, primarily for commodities like soy, cattle pasture, and palm oil, with only about half of cleared land becoming productive farmland due to abandonment or low yields.^[112] ^[113] Between 1980 and 2000, more than 80 percent of new tropical agricultural land derived from rainforest clearance, reflecting patterns of smallholder shifting systems transitioning to large-scale plantations.^[114] Sustainable land management remains challenged by weak governance, though data indicate that geography alone does not preclude intensification when institutions support it.^[115]

Deforestation and Habitat Alteration

Tropical deforestation constitutes the predominant form of global forest loss, accounting for approximately 95% of total deforestation, with primary drivers rooted in agricultural expansion. Between 1990 and 2020, an estimated 420 million hectares of forest were lost worldwide, the majority in tropical regions.^[116] Annual rates have declined from 17.6 million hectares in 1990–2000 to 10.9 million hectares in 2015–2025, yet tropical primary forest loss remains substantial, exacerbated by fires and commodity production in 2024.^[117] ^[118] In Latin America, particularly the Amazon Basin, cattle ranching and soybean cultivation drive over 80% of deforestation, converting vast tracts into pastures and croplands; Brazil alone lost 1.7 million hectares of tree cover in 2023.^[113] ^[119] Southeast Asia experiences high rates linked to palm oil plantations and logging, with Indonesia and Malaysia contributing 28% of tropical losses through commercial agriculture and infrastructure.^[120] In Africa, the Congo Basin saw a 12.5% increase in deforestation in 2023 compared to 2018–2020 baselines, fueled by subsistence farming, mining, and selective logging that fragments habitats.^[121] These activities often involve slash-and-burn practices, which degrade soil fertility and perpetuate cycles of further clearing.^[122] Habitat alteration extends beyond outright removal, manifesting in forest fragmentation that creates isolated patches vulnerable to edge effects, such as increased wind exposure, invasive species ingress, and microclimate shifts. In highly deforested landscapes, remaining fragments exhibit reduced canopy integrity and understory diversity, amplifying biodiversity collapse; for instance, Amazonian fragments in deforested areas show diminished ecosystem functionality.^[123] This fragmentation disrupts migratory corridors and pollination networks, leading to localized extinctions; studies indicate that 95% of Amazon species have been exposed to fire-impacted areas since 2001, totaling 40,000 to 73,400 square miles affected.^[124] The resultant biodiversity impacts are profound, with habitat loss directly correlating to species population declines and heightened extinction risks, particularly for endemics reliant on contiguous forest interiors. Tropical deforestation reduces overall species richness by altering food webs and resource availability, while biophysical effects like decreased evapotranspiration contribute to drier regional conditions, further stressing habitats.^[125] ^[126] Weak enforcement in tropical nations, often due to governance challenges rather than solely external demand, sustains these trends despite international pledges.^[127]

Economic and Developmental Aspects

Resource Extraction and Trade

The tropics host substantial reserves of fossil fuels, with crude oil extraction concentrated in equatorial basins such as the Niger Delta in Nigeria, the Orinoco Belt in Venezuela, and offshore fields in Indonesia. In 2023, global crude oil production averaged 81.8 million barrels per day, with tropical producers like Nigeria contributing around 1.4 million barrels per day, primarily from shallow-water and onshore operations vulnerable to sabotage and spills. Indonesia, another key player, produced approximately 600,000 barrels per day, supplemented by natural gas from fields like the Natuna Sea, which together form over 20% of the country's export revenues.^[128] These resources are traded as raw commodities on global markets, with exports routed through ports like Bonny in Nigeria or Balikpapan in Indonesia, often facing logistical bottlenecks from inadequate infrastructure.^[129] Mineral extraction drives significant economic activity in tropical Africa and Southeast Asia, where deposits of cobalt, copper, and bauxite underpin battery and aluminum industries. The Democratic Republic of the Congo (DRC), spanning the equatorial zone, accounted for over 70% of global cobalt output in 2023, producing roughly 170,000 metric tons from artisanal and industrial mines in Katanga province, amid reports of hazardous labor conditions and supply chain opacity.^[130] Copper production in tropical Zambia reached 700,000 metric tons that year, extracted via underground methods in the Copperbelt, with exports valued at billions supporting foreign exchange.^[131] Bauxite mining in Guinea, a tropical West African nation, yielded over 100 million metric tons in 2023, shipped primarily to China and Europe for alumina refining, representing more than 90% of Guinea's export earnings despite limited domestic processing. These minerals are exported in ore or concentrate form, with trade flows dominated by bulk carriers to industrialized importers, exacerbating dependency on volatile commodity prices. Renewable biological resources, including timber and palm oil, form another pillar of tropical extraction and trade. Industrial logging in Indonesian and Brazilian rainforests contributed to 3.7 million hectares of primary tropical forest loss in 2023, yielding sawnwood and plywood exports valued at over $10 billion annually from Southeast Asia alone, per International Tropical Timber Organization data.^[132] Palm oil, derived from plantations across equatorial belts, saw Indonesia produce 46 million metric tons of crude palm oil in 2023, with exports exceeding 30 million tons shipped to India and Europe for food, fuel, and cosmetics, generating $20-25 billion in revenue.^[133] Malaysia added 19.4 million metric tons, its shipments totaling 15.1 million tons that year, underscoring the sector's role in funding infrastructure but also linked to land conversion pressures.^[134] Trade in these goods relies on riverine and coastal transport, with value chains often exporting unprocessed materials to temperate-zone refiners, limiting local industrialization.^[135]

Challenges to Growth: Geography vs. Institutions

Tropical regions face persistent economic underdevelopment, with average GDP per capita in tropical countries standing at approximately $3,326 in 1995, compared to higher levels in non-tropical nations, prompting debate over whether inherent geographical factors or institutional quality primarily constrain growth.^[136] Proponents of geographical determinism, such as Jeffrey Sachs, argue that tropical climates impose structural barriers including high disease prevalence, nutrient-poor soils, and erratic precipitation patterns that hinder agricultural productivity and human capital formation.^[137] For instance, malaria's endemic presence in sub-Saharan Africa and Southeast Asia correlates with a 1.3% annual reduction in economic growth due to morbidity and mortality effects on labor productivity.^[138] These endowments limit the suitability of high-yield crops like wheat and barley, favoring lower-productivity staples such as cassava and yams, while high humidity fosters pests and pathogens that degrade infrastructure and health outcomes.^[139] Empirical analyses using geographic information systems (GIS) reveal spatial clustering of poverty in tropical lowlands, where elevation below 1,000 meters exacerbates heat stress and vector-borne diseases, contrasting with higher-altitude or temperate zones that historically supported denser populations and technological diffusion.^[137] Cross-country regressions incorporating variables like land area in tropics as a proxy for climate find a negative association with GDP per capita, even after controlling for policy factors, suggesting geography's independent role in suppressing investment and innovation.^[140] Higher temperatures in tropical zones also correlate with reduced economic output, as evidenced by subnational data showing a 1% GDP per capita decline per degree Celsius increase in average temperature.^[141] Counterarguments emphasize institutions as the dominant causal factor, positing that geographical constraints are surmountable under inclusive governance structures prioritizing property rights, rule of law, and market incentives.^[142] Historical evidence from the "reversal of fortune" illustrates this: resource-rich tropical colonies like India and Indonesia, prosperous in 1500 CE with GDPs per capita rivaling Europe's, declined under extractive European institutions that entrenched elite capture and stifled commerce, while initially sparse settler economies in Australia and North America adopted inclusive frameworks fostering growth.^[142] Instrumental variable approaches exploiting settler mortality rates as a proxy for institutional quality show that European-style institutions explain up to 75% of income variation across former colonies, overshadowing direct geographical effects.^[139] Within-tropics variation reinforces institutional primacy: Singapore, fully tropical, achieved a GDP per capita exceeding $80,000 by 2023 through robust anti-corruption measures and trade openness, outperforming geographically similar but institutionally weaker neighbors like Indonesia or Malaysia.^[143] Similarly, econometric models indicate that tropical, germ, and crop endowments influence development primarily via their impact on institutional formation—such as fostering extractive elites in disease-prone areas—rather than direct channels, with no residual geographical effect once institutions are accounted for.^[139] Critiques of pure geographical explanations, including those applied to Africa, highlight that policy reversals under improved governance, as in post-apartheid Botswana, yield growth accelerations unrelated to climatic shifts, underscoring causal realism in institutional reforms over immutable endowments.^[144] Thus, while geography presents formidable hurdles, empirical patterns suggest institutions mediate and often override these, determining whether tropical economies stagnate or thrive.

Case Studies of Tropical Economies

Singapore's transformation from a resource-poor entrepôt in 1965, with a GDP per capita of approximately $500, to a high-income economy with $88,000 per capita by 2023 exemplifies institutional factors overriding tropical constraints such as high humidity, disease prevalence, and lack of arable land.^[145]^[146] Under Lee Kuan Yew's leadership, policies emphasized anti-corruption enforcement, merit-based civil service, compulsory education, and openness to foreign investment and trade, fostering manufacturing diversification from textiles to electronics and finance.^[147]^[148] By prioritizing rule of law and human capital development, Singapore achieved average annual GDP growth exceeding 6% from 1965 to 2020, despite no natural resources beyond its strategic port location.^[149] Mauritius, an Indian Ocean island nation fully within the tropics, transitioned from sugar monoculture dependence post-independence in 1968, with GDP per capita under $1,000, to $11,613 by 2023 through institutional reforms promoting export-oriented industrialization and financial services.^[150]^[151] Establishment of export processing zones in the 1970s, coupled with political stability, low corruption, and diversified sectors including tourism and offshore banking, sustained over 5% annual growth for three decades, elevating it to upper-middle-income status among African economies.^[152]^[153] These outcomes reflect effective property rights enforcement and pragmatic economic policies, mitigating vulnerabilities like cyclone risks and ethnic diversity, rather than climatic endowments.^[154] In contrast, Nigeria, Africa's most populous tropical nation and a major oil producer since the 1970s, exemplifies the resource curse, with GDP per capita stagnating at $1,597 in 2023 despite vast hydrocarbon reserves comprising over 90% of exports.^[155] Weak institutions, marked by endemic corruption, patronage politics, and inadequate diversification, have led to Dutch disease effects, neglecting agriculture and manufacturing while inflating currency and fostering inequality.^[156]^[157] Oil revenues, peaking at $100 billion annually in the 2010s, failed to translate into broad development due to governance failures, including embezzlement and infrastructure deficits, resulting in over 40% poverty rates and recurrent economic volatility.^[158] Comparative institutional metrics, such as rule of law indices, highlight Nigeria's lag behind Singapore, where similar tropical conditions coexist with superior policy execution.^[159] These cases illustrate that while tropical environments pose uniform challenges like soil leaching and pathogen loads, divergent outcomes stem primarily from institutional quality—secure property rights, accountable governance, and incentive-aligned policies—enabling Singapore and Mauritius to harness global trade, whereas Nigeria's extractive institutions perpetuate underperformance.^[152]^[154]

Health and Disease Dynamics

Prevalent Endemic Diseases

The tropics are characterized by a high burden of endemic diseases, primarily vector-borne and parasitic infections facilitated by warm temperatures, high humidity, and abundant water sources that support mosquito, snail, and sandfly vectors. These conditions enable year-round transmission cycles, contrasting with seasonal patterns in temperate zones. Neglected tropical diseases (NTDs), a group of 20 conditions including schistosomiasis, leishmaniasis, and trypanosomiasis, disproportionately affect impoverished communities in tropical regions, with an estimated 1 billion people at risk globally.^[160] Malaria, caused by Plasmodium parasites and transmitted by Anopheles mosquitoes, remains the most lethal, with 249 million cases and 608,000 deaths reported worldwide in 2022, over 90% in sub-Saharan Africa and other tropical areas.^[161] Dengue fever, transmitted by Aedes mosquitoes, affects nearly 4 billion people in tropical and subtropical zones, serving as a leading cause of acute febrile illness. In 2024, over 14 million cases and nearly 12,000 deaths were recorded globally, marking the worst year on record and highlighting the disease's expansion into urban tropical settings.^[162] Yellow fever, a viral hemorrhagic disease spread by Aedes and Haemagogus mosquitoes, is endemic to tropical regions of Africa and the Americas, with 212 confirmed cases in the Americas through mid-2025—a threefold rise from 61 cases in 2024—often linked to sylvatic cycles in forested areas spilling into human populations.^[163] Parasitic infections like schistosomiasis, caused by Schistosoma trematodes via freshwater snail intermediates, prevail in 78 tropical and subtropical countries, with over 250 million people infected annually and 90% of cases in Africa; transmission thrives in irrigated agricultural zones and stagnant waters common to tropical hydrology.^[164] Leishmaniasis, transmitted by sandflies, and human African trypanosomiasis (sleeping sickness), spread by tsetse flies, are co-endemic in tropical foci, contributing to millions of disability-adjusted life years through cutaneous ulcers, visceral organ damage, and neurological decline.^[165] Chagas disease (Trypanosoma cruzi via triatomine bugs) endangers 21 tropical American countries, with underreported cases underscoring diagnostic gaps in rural endemic zones. These diseases often overlap geographically with malaria, amplifying morbidity through compounded immune suppression and nutritional deficits in affected populations.^[166]

Environmental and Socioeconomic Factors

Environmental factors in the tropics, including consistently high temperatures averaging 25–30°C, elevated humidity, and seasonal heavy rainfall, create optimal conditions for the proliferation of disease vectors such as mosquitoes (Aedes and Anopheles species) that transmit pathogens like dengue virus and Plasmodium parasites responsible for malaria.^[167] These climatic variables sustain year-round breeding sites in standing water and accelerate pathogen development within vectors, with transmission efficiency peaking at temperatures between 20–32°C for many arboviruses and protozoa.^[168] High biodiversity in tropical ecosystems further facilitates zoonotic spillovers, as dense forests and wetlands harbor reservoirs for diseases like yellow fever and leishmaniasis, where deforestation exposes human populations to altered habitats without eradicating underlying vector dynamics.^[169] Socioeconomic conditions exacerbate these environmental risks, with poverty correlating strongly to inadequate housing, lack of vector control measures like bed nets or screens, and insufficient sanitation infrastructure that promotes mosquito breeding in unmanaged waste and water sources.^[170] In tropical regions, over 1 billion people live in extreme poverty, often in informal settlements with overcrowding and limited access to clean water, which heightens exposure to fecal-oral transmitted neglected tropical diseases (NTDs) such as soil-transmitted helminthiases and schistosomiasis.^[171] Poor nutrition and malnutrition, prevalent in low-income tropical households, impair immune responses, increasing susceptibility and severity of infections like tuberculosis and HIV co-morbidities with endemic parasites.^[172] The interplay of these factors reveals causal chains where environmental suitability alone does not determine prevalence; for instance, malaria incidence remains low in some affluent tropical areas with robust infrastructure despite ideal climates, underscoring how institutional failures in sanitation and healthcare access amplify disease burdens beyond geophysical constraints.^[173] Rural agricultural communities in the tropics, characterized by high poverty rates exceeding 40% in sub-Saharan and Southeast Asian hotspots, face elevated risks from unregulated land use and seasonal flooding that combine with economic marginalization to sustain transmission cycles.^[174] Empirical studies indicate that improving water, sanitation, and hygiene (WASH) interventions can reduce NTD prevalence by up to 50% in impoverished settings, independent of climatic variability.^[175]

Modern Interventions and Outcomes

Modern interventions against tropical diseases emphasize vector control, pharmacological treatments, and vaccination campaigns, often coordinated by organizations such as the World Health Organization (WHO) and the Global Polio Eradication Initiative (GPEI). Insecticide-treated bed nets (ITNs) have proven effective in reducing malaria transmission, with community trials in African settings showing a approximately 20% reduction in all-cause under-5 mortality.^[176] Artemisinin-based combination therapies (ACTs) serve as first-line treatments for uncomplicated Plasmodium falciparum malaria, leading to dramatic declines in morbidity and mortality; for instance, in Zanzibar following 2003 deployment, malaria-associated cases dropped sharply within two years.^[177]^[178] Mass drug administration and praziquantel distribution have targeted schistosomiasis, though global burden estimates remain uncertain due to diagnostic limitations and underreporting.^[179] Arboviral diseases like dengue, chikungunya, and Zika have seen limited vaccine successes amid ongoing outbreaks. The Q-denga (TAK-003) vaccine, recommended by WHO for children aged 6–16 in high-burden areas as of 2025, offers partial protection but requires serostatus considerations to avoid risks in naive individuals.^[180] Chikungunya vaccine candidates, including live-attenuated and virus-like particle formulations, advanced to licensure discussions in 2023–2025, yet surges in 2025 across 119 countries underscore gaps in deployment and vector management.^[181]^[182] Yellow fever vaccination prevents severe outcomes but cannot achieve eradication due to sylvatic cycles involving non-human primates.^[183] Outcomes reflect partial triumphs tempered by biological and logistical challenges. Global immunization efforts, including those for polio and measles prevalent in tropical regions, averted an estimated 154 million deaths over 50 years through 2024, with polio cases reduced by over 99% since 1988 via routine vaccination and surveillance.^[184]^[185] Malaria interventions averted millions of child deaths since 2000, yet insecticide resistance threatens ITN efficacy, contributing to stalled progress in sub-Saharan Africa.^[186] Neglected tropical diseases (NTDs) like schistosomiasis persist despite integrated control, with 251.4 million cases reported in 2021, highlighting needs for improved diagnostics and sustained funding amid socioeconomic barriers.^[187] Empirical data indicate that while targeted tools reduce incidence—e.g., 41% decline in under-5 mortality post-ITN campaigns in rural areas—eradication eludes most pathogens due to vector resilience, drug resistance, and uneven implementation rather than inherent geographic determinism.^[188]

Climate Change Considerations

Empirical Trends in Tropical Climates

Surface air temperatures in tropical regions have risen by approximately 0.8°C from 1950 to the present, as indicated by reanalysis datasets like ERA5, though this rate is lower than in extratropical zones due to the absence of strong polar amplification effects.^[189] This warming is evident in both land and ocean surfaces, with sea surface temperatures in the tropical oceans increasing at a similar pace, contributing to expanded zones of high heat stress during peak seasons.^[190] Regional variations exist, such as accelerated warming in the tropical eastern Pacific during El Niño phases, but long-term trends remain consistent across major basins.^[191] Precipitation patterns in the deep tropics (10°S–10°N) exhibit a modest upward trend of about 3.7% over the 27 years ending around 2007, based on zonally averaged Global Precipitation Climatology Project (GPCP) data combining land and ocean observations. Updated GPCP Version 3.2 analyses confirm positive trends in deep tropical rainfall, with global precipitation totals rising by roughly 4.5% in refined estimates, though interdecadal variability tied to modes like the Madden-Julian Oscillation introduces fluctuations.^[192] Over broader tropical domains, trends are regionally heterogeneous: increases in the Maritime Continent and parts of the Indian Ocean contrast with declines in Sahelian zones and southern tropical Africa, reflecting shifts in convergence zones rather than uniform intensification.^[193] Tropical cyclone activity shows no robust global increase in frequency since reliable records began in the satellite era (circa 1970), with annual counts averaging 80–90 systems and some basins, like the North Atlantic pre-1995, exhibiting downward trends before recent upticks linked to natural variability.^[194] However, the proportion of intense cyclones (Category 3–5 on the Saffir-Simpson scale) has risen by about 5% per decade since the 1970s, alongside increases in peak intensification rates by up to 28.7% in the modern era (2001–2020) compared to 1971–1990.^[195]^[196] From 1990 to 2021, global tropical cyclone metrics, including power dissipation indices, display stable or slightly declining overall activity amid improved detection, underscoring that intensity metrics have trended upward more clearly than raw counts.^[197] These patterns hold across NOAA and GFDL assessments, which emphasize empirical adjustments for historical undercounting.^[57]

Causal Attributions and Debates

Attribution studies employing detection and attribution methods, which compare observed tropical climate trends to model simulations with and without anthropogenic forcings, primarily ascribe post-1950 warming in the tropics—estimated at approximately 0.8°C—to elevated greenhouse gas concentrations, particularly CO2, rather than natural factors alone.^[60] These analyses rely on diagnostic fingerprints, such as amplified warming in the upper tropical troposphere and stratospheric cooling, as evidence of radiative forcing from human emissions overriding solar or volcanic influences.^[198] However, tropical surface temperatures have warmed more slowly than polar regions, aligning with theoretical expectations of limited heat diffusion to low latitudes, though empirical satellite records from 1979–2020 indicate mid-tropospheric tropical amplification below model predictions.^[199] Debates persist over the extent to which natural internal variability, including oscillations like ENSO and the Atlantic Multidecadal Oscillation, confounds anthropogenic signals in the tropics, where decadal fluctuations can produce warming or cooling episodes rivaling greenhouse gas effects on regional scales.^[200] For instance, interannual couplings between tropical land temperatures and atmospheric CO2 growth rates suggest feedback loops involving vegetation and fires, but these may reflect natural drought cycles amplified by land-use changes rather than direct CO2 radiative forcing.^[201] Critics contend that climate models underpinning attributions inadequately capture tropical convection and precipitation dynamics, leading to divergent projections—such as enhanced wet-season rainfall—unsupported by observations, which show stalled or regionally variable trends since the 1980s.^[202]^[203] Skeptical perspectives emphasize empirical shortcomings in causal claims, noting that peer-reviewed evaluations reveal consistent model overestimation of tropical warming rates across CMIP ensembles, with CMIP6 projections exceeding observations by up to 0.5°C per decade in some low-latitude zones.^[199] Regarding tropical cyclones, while some studies attribute intensified rainfall to warmer sea surface temperatures linked to CO2, comprehensive reviews highlight no detectable global increase in frequency or overall intensity, attributing apparent trends to improved detection and natural multidecadal variability rather than dominant anthropogenic causation.^[204] ^[205] These critiques, often from analysts outside consensus bodies, argue that institutional sources like IPCC assessments exhibit overconfidence by downplaying natural drivers and model uncertainties, potentially influenced by selection biases favoring alarmist interpretations.^[206]^[203]

Adaptation Strategies and Skeptical Views

Adaptation strategies in tropical regions primarily focus on agriculture, coastal protection, and water management to mitigate projected risks such as altered precipitation patterns and sea-level rise. Farmers in tropical areas like Southeast Asia and sub-Saharan Africa have adopted drought-tolerant crop varieties, such as improved maize and rice strains, which have increased yields by 10-20% under variable rainfall conditions according to field trials in Indonesia and Kenya.^[207] Irrigation expansions and diversified cropping systems, including intercropping with legumes, have similarly enhanced resilience, with empirical studies from tropical drylands reporting reduced income volatility by up to 15% during dry spells.^[208] Coastal strategies emphasize ecosystem-based approaches, such as mangrove restoration in countries like Bangladesh and Vietnam, where restored forests have demonstrated a capacity to reduce wave heights by 20-50% during storms, thereby protecting low-lying communities.^[209] Infrastructure adaptations include early warning systems for tropical cyclones and flood defenses, which have proven effective in reducing fatalities; for instance, Bangladesh's cyclone shelters and forecasting network, implemented since the 1970s, have lowered death tolls from thousands to dozens per event despite population growth.^[210] However, evaluations in developing tropical nations reveal implementation challenges, including limited funding and technical capacity, with only 14% of planned adaptations in biodiversity-focused projects showing empirical success in enhancing outcomes.^[211] Joint strategies combining multiple measures, such as agroforestry with financial insurance, have boosted productivity and net income in tropical smallholder systems, yet scalability remains constrained by socioeconomic barriers.^[212] Skeptical views contend that mainstream projections of severe tropical impacts, such as escalating cyclone intensity, overestimate risks due to flaws in climate models, with observational data showing no detectable increase in global tropical cyclone frequency or landfall intensity since reliable records began in the 1970s.^[213] Critics like Roger Pielke Jr. argue that IPCC assessments have conveyed misleading certainty on these trends, ignoring normalized disaster loss data that, when adjusted for economic growth and exposure, indicate no upward trend attributable to anthropogenic warming.^[214] In tropical forests, empirical evidence suggests greater acclimation potential than alarmist scenarios imply, with species responses to warming often buffered by natural variability rather than requiring unprecedented interventions.^[215] These perspectives prioritize economic development as the primary driver of adaptive capacity, noting that wealthier tropical economies historically adapt to variability—such as El Niño events—more effectively than mitigation-focused policies, which divert resources from poverty alleviation.^[216] Such skepticism highlights systemic biases in IPCC processes, where political influences may amplify uncertain projections to justify global agendas, as evidenced by discrepancies between model outputs and satellite/tropospheric observations in the tropics showing less warming than predicted.^[217] Proponents argue that focusing on verifiable, localized adaptations yields higher returns than speculative global efforts, with historical precedents like post-colonial agricultural innovations in tropical Asia demonstrating resilience without invoking climate exceptionalism.^[218]

Cultural and Societal Perceptions

Representations in Literature and Media

In literature, the tropics are recurrently depicted as landscapes of profound isolation, teeming biodiversity, and existential trial, often symbolizing humanity's confrontation with untamed nature and colonial ambition. Daniel Defoe's Robinson Crusoe (1719) casts a deserted tropical island—likely inspired by Caribbean or Pacific locales—as a forge for self-reliance, where the protagonist endures fevers, storms, and scarcity to impose order, reflecting empirical accounts of shipwreck survival amid equatorial hardships like humidity-induced illness and resource volatility.^[219] Joseph Conrad's Heart of Darkness (1899), set in the Congolese riverine tropics during the 1890s Belgian exploitation, portrays the region's impenetrable forests and sweltering miasma as mirrors to moral entropy, with the jungle's causal density—vines, insects, and fog—amplifying themes of imperial greed and primal regression, drawn from Conrad's own 1890 steamer voyage exposing 80-90% mortality rates among forced laborers from disease and overwork.^[220] These works, rooted in European travelogues, privilege outsider gazes that emphasize peril over indigenous adaptations, a pattern critiqued in scholarly analyses for embedding causal assumptions of tropical inferiority despite evidence of pre-colonial thriving societies.^[221] Latin American authors reframed tropical settings through endogenous lenses, integrating empirical regional histories with narrative innovation. Gabriel García Márquez's One Hundred Years of Solitude (1967), modeled on his Aracataca birthplace in Colombia's 1920s-1940s Caribbean lowlands, evokes the tropics via relentless rains—mirroring the 1928 United Fruit Company massacre that killed up to 3,000 striking banana workers—and cyclical floods, blending factual labor strife with hyperbolic lushness to dissect isolation, where the humid, fruit-laden environs causally entwine prosperity with decay.^[222] Such portrayals counter earlier exoticism by grounding magic in verifiable tropical dynamics, like monsoon variability driving agricultural booms and busts, though academic reviews note persistent romanticization that underplays socioeconomic causation in underdevelopment.^[223] Film and media amplify these binaries, juxtaposing idyllic seascapes against lurking threats to evoke adventure amid equatorial volatility. Early Hollywood spectacles like King Kong (1933) envision tropical Skull Island—filmed partly in California studios—as a fog-shrouded jungle harboring colossal beasts, trope-ifying the tropics as prehistoric peril zones where 20th-century explorers confront evolutionary atavism.^[224] Postwar entries such as Francis Ford Coppola's Apocalypse Now (1979), adapting Conrad to 1960s-1970s Vietnam's Mekong Delta, render monsoonal rice paddies and mangroves as hallucinatory hellscapes, with napalm-scorched foliage underscoring causal links between humidity-fueled guerrilla warfare and psychological fracture, informed by 58,000 U.S. combat deaths tied to terrain advantages.^[225] Contemporary blockbusters, including Jurassic Park (1993) utilizing Costa Rica's rainforests for dinosaur enclosures, perpetuate the paradise-danger dialectic, where lush canopies conceal genetic hubris, yet critiques highlight how such U.S.-centric productions—often proxy-filming in Hawaii for 70% of "tropical" scenes—distort local ecologies and cultures, prioritizing spectacle over data on biodiversity loss from deforestation rates exceeding 1% annually in depicted regions.^[226]^[224] These media forms, while drawing from climatic realities like cyclone-prone coasts, have faced scrutiny for source biases in Western studios that amplify stereotypes, sidelining empirical indigenous resilience evidenced in oral histories and archaeological records.^[227]

Colonial Legacies and Modern Narratives

European colonization of tropical regions, spanning from the 15th to 20th centuries, primarily emphasized resource extraction rather than large-scale settlement, owing to high settler mortality from endemic diseases like malaria and yellow fever.^[228] In areas such as sub-Saharan Africa, Southeast Asia, and the Caribbean—core tropical zones—colonial powers established extractive institutions focused on commodities like sugar, rubber, and minerals, often relying on coerced labor systems including slavery and indenture, which displaced millions and entrenched economic dependencies.^[229] These institutions, designed for metropolitan benefit, left legacies of unequal land distribution and fiscal structures prioritizing export over local development, contributing to persistent inequality in post-colonial states.^[230] However, empirical analyses reveal heterogeneous outcomes, with some tropical colonies experiencing infrastructural gains from cash crop economies; for instance, colonial-era production of export crops correlated with increased urbanization, road networks, and household wealth in regions like West Africa and Indonesia decades later.^[231] Island colonies with prolonged European presence, such as those in the Caribbean and Pacific tropics, demonstrated higher per capita incomes and reduced infant mortality compared to non-colonized peers, attributable to introduced legal and health systems despite initial exploitation.^[232] Arbitrary border delineations, ignoring ethnic and ecological realities, fostered post-independence conflicts and weak governance in many tropical nations, as seen in Africa's Sahel-to-equator belt where over 50% of modern civil wars trace to such divisions.^[229] Contemporary narratives, particularly in Western academia and media, frequently frame tropical underdevelopment as a direct, unmitigated consequence of colonial "extractivism," emphasizing reparations and decolonization rhetoric while downplaying post-colonial agency and geographic factors like tropical soil infertility and disease prevalence that hindered pre- and post-colonial productivity.^[229] This perspective, prevalent in institutions with documented left-leaning biases, often attributes disparities to historical oppression without rigorous controls for endogenous variables such as governance quality or cultural norms, leading to selective sourcing that amplifies victimhood over evidence of institutional transplants enabling growth in outliers like Singapore or Botswana.^[228] Causal realism demands scrutiny: while colonialism imposed costs, including demographic collapses from introduced diseases reducing indigenous populations by up to 90% in neotropical zones, it also disseminated technologies and markets that, in measurable cases, elevated baseline economies beyond autarkic stagnation.^[233] Balanced assessments, drawing from econometric studies, underscore that extractive legacies persist where local elites perpetuated them post-independence, rather than as immutable curses.^[232]

References

[1]
Meet the Tropics | METEO 3: Introductory Meteorology - Dutton Institute
Other definitions are based on geography, and define the tropics as the area between certain latitude lines in each hemisphere.
[2]
[PDF] Tropical Underdevelopment - The Earth Institute
The geographical tropics are conventionally defined as the region of the Earth in which the sun passes directly overhead at some point during the year.
[3]
Tropical Weather Systems - NOAA
Jul 26, 2023 · The tropics refers to the region of Earth around the equator. The weather here is, on average, hot and humid.Inter-Tropical Convergence Zone · Tropical Cyclone Structure
[4]
[PDF] The climates of the Tropics, and how they are changing
Tropical climates are warm, with mean temperatures exceeding 20°C, and a small annual range. The coolest month's mean temperature exceeds 18°C.
[5]
Biodiversity in rainforests
Tropical rainforests have the highest mean net primary production of any terrestrial ecosystem, meaning they store more carbon per unit area than any other type ...<|control11|><|separator|>
[6]
Tropical forests are home to over half of the world's vertebrate species
Oct 7, 2021 · It is widely espoused that tropical forests harbor more than half of Earth's biodiversity. This assertion has persisted in the scientific ...
[7]
Why are there so many species in the tropics? - PubMed Central
The number of species increases much more rapidly with decreasing latitude and increasing temperature than the increase in total ecosystem energy supply (NPP), ...
[8]
Evolution of Tropical Biodiversity Hotspots
Dec 10, 2020 · From plants and insects to birds, amphibians, and mammals, scientists estimate that tropical forests contain more than half the species on Earth ...
[9]
Tropic - Etymology, Origin & Meaning
Originating in late 14c. from Medieval Latin tropicus and Greek tropikos, "tropic" means the celestial circles marking solstice points, relating to turning ...
[10]
TROPIC Definition & Meaning - Merriam-Webster
Sep 27, 2025 · The meaning of TROPIC is either of the two parallels of terrestrial latitude at a distance of about 231/2 degrees north or south of the ...
[11]
Origin of word "tropic" from Tropic of Capricorn, Tropic of Cancer
Jun 30, 2020 · From Late Latin tropicus (“of or pertaining to the solstice, as a noun, one of the tropics”), from Ancient Greek τροπικός (tropikós, “of or ...
[12]
In a Word: Tropical Tropes | The Saturday Evening Post
Jun 10, 2021 · In ancient Greek, the word for “a turning” was trope, and the adjective meaning “pertaining to a turn” was tropikos.
[13]
tropical, adj. & n. meanings, etymology and more
Tropical are those to which when the sun comes, he comes back and makes a conversion. Such are the signs, Aries, and its opposite Libra, and Capricorn and ...
[14]
The Classification of Climates from Pythagoras to Koeppen
The concept of a spherical world is attributed to the Greek philosopher Pythagoras in the sixth century B.C. His disciple Parmenides stipulated five zones on ...Missing: perceptions | Show results with:perceptions
[15]
How Ancient Greece Created Our Climate Zones - AMS Weather Band
Aug 4, 2021 · He believed, however, that the excessive heat in the torrid zone would prevent the exploration of this southern zone (Harley and Woodward 1987).
[16]
Aristotle's Climate Zones - ThoughtCo
Jul 3, 2019 · Because Aristotle believed the regions centered around the equator were too hot to be inhabited, he dubbed them the "torrid" zones. We know them ...Missing: perceptions | Show results with:perceptions<|separator|>
[17]
Temperate, Torrid, and Frigid Zones - ThoughtCo
Feb 24, 2019 · The ancient Greek scholar Aristotle hypothesized that the earth was divided into three types of climatic zones, each based on distance from the equator.Missing: perceptions | Show results with:perceptions
[18]
How the world is turning tropical before our eyes - The Conversation
Jun 29, 2014 · The Torrid Zone was full of human troglodytes who ate vipers and men who moved like serpents. Ancient Indian geographers described the Tropics ...Missing: perceptions | Show results with:perceptions
[19]
https://oxfordre.com/climatescience/display/10.1093/acrefore/9780190228620.001.0001/acrefore-9780190228620-e-836
[20]
[PDF] Experience of the New World and Aristotelian Revisions of the ...
Aristotle's view that there exists an uninhabitable “torrid zone” in the area between the Tropic of. Capricorn and the Tropic of Cancer. It has been argued ...
[21]
The Ugly History of Climate Determinism Is Still Evident Today
Jun 24, 2020 · A long, ugly history of climate determinism: the racially motivated notion that the climate influences human intelligence and societal development.
[22]
Earth's Axial Tilt – Obliquity - Time and Date
Today, on October 24, 2025 at noon, Earth's axial tilt, or mean obliquity was 23.43592° or 23°26'09.3". Earth's mean obliquity today is about 0.00001°, or 0.04" ...
[23]
Milankovitch (Orbital) Cycles and Their Role in Earth's Climate
Feb 27, 2020 · Earth's axis is currently tilted 23.4 degrees, or about half way between its extremes, and this angle is very slowly decreasing in a cycle that ...
[24]
Earth's Tilt on its Axis | Seasonal Changes & History - Study.com
Earth's axial tilt or obliquity varies between 22.1 to 24.5 degrees within a 41 000-year cycle. A larger tilt angle brings more extreme seasons in the higher ...
[25]
Climate Zones | National Oceanic and Atmospheric Administration
Jun 13, 2023 · Moist tropical climates extend north and south from the equator to about 15° to 25° latitude. In these climates, all months have average ...
[26]
Urban Growth and Heat in Tropical Climates - Frontiers
Aug 12, 2021 · This research describes the change in temperatures across approximately 270 tropical cities from 1960 to 2020 with a focus on urban warming.
[27]
Tropical climates are the most biodiverse on Earth − but it's not only ...
Sep 28, 2023 · A new study reveals how the geography of global climates influences the rich patterns of species diversity in an ever-changing world.
[28]
What Are the Different Climate Types? | NESDIS - NOAA
A: Tropical. In this hot and humid zone, the average temperatures are greater than 64°F (18°C) year-round and there is more than 59 ...
[29]
Tropical Zones - an overview | ScienceDirect Topics
The tropical zone is defined as a conceptual and geographical area characterized by its climate, which is perceived as 'other' compared to northern ...
[30]
[PDF] All About that Tilt: Sun and Seasons - NASA Earth Observatory
During the summer solstice, the Sun shines most directly on the Tropic of Cancer, 23.5 degrees north ... directly on the Tropic of Capricorn, 23.5 degrees.
[31]
The Seasons, the Equinox, and the Solstices
The summer solstice occurs when the sun is directly over the Tropic of Cancer, which is located at 23.5° latitude North and runs through Mexico, the Bahamas, ...<|separator|>
[32]
Geo Explainer: The tropics - Geographical Magazine
Jul 6, 2023 · The tropics are the geographical zone encompassing the regions around the equator, situated between the latitude lines of the Tropic of Cancer and the Tropic ...Missing: boundaries | Show results with:boundaries
[33]
Tropics - National Geographic Education
Oct 19, 2023 · The tropics are regions of Earth that lie roughly in the middle of the globe. The tropics between the latitude lines of the Tropic of Cancer and ...Missing: ecological | Show results with:ecological
[34]
Tropical rivers - ScienceDirect.com
The tropical rivers across the globe drain a variety of geologic–geomorphologic settings: (a) orogenic mountains belts, (b) sedimentary and basaltic plateau/ ...
[35]
[PDF] Climate, tectonics, and the morphology of the Andes
Climate variations, especially precipitation, strongly influence the morphology of the Andes, with erosion rates and features relating to climatic regimes.<|separator|>
[36]
Seismicity of the Earth 1900-2013 East African Rift - USGS.gov
The East African Rift system (EARS) is a 3,000-km-long Cenozoic age continental rift extending from the Afar triple junction, between the horn of Africa and ...
[37]
East African Rift Valley | The Geological Society of London
Both the eastern and western rifts are characterized by volcanic activity, brittle faulting and large asymmetric half graben systems filled with river and lake ...
[38]
Volcanic Arc Weathering Rates in the Humid Tropics Controlled by ...
Mar 7, 2024 · Volcanic arcs are chemical weathering hotspots that may contribute disproportionately to global CO2 consumption through silicate weathering.
[39]
Tropical Coast Landforms (U.S. National Park Service)
Dec 12, 2018 · Geologic Features of Tropical Coasts ... Reefs that are exposed above sea level are among the most massive and impressive landforms. Today, such ...
[40]
Tropical Moist Climates
Global Climate - Tropical Moist Climates. General Characteristics - year-round warm temperatures (all months have mean temperatures above 18 C [64 F]) and ...
[41]
Rainforest - Kids Do Ecology - KDE Santa Barbara
The average temperature in tropical rainforests ranges from 70 to 85°F (21 to 30°C). The environment is pretty wet in tropical rainforests, maintaining a ...
[42]
Wet Dry Tropical Climate - The Physical Environment
Mean monthly temperatures in the Tropical Wet/Dry climate range from 18oC (64.4oF) to above 25oC (77oF). Like the monsoon climate, the maximum temperature tends ...Missing: regions | Show results with:regions
[43]
Inter-Tropical Convergence Zone - NOAA
Jul 18, 2023 · In the Northern Hemisphere, the wet season occurs from May to July; in the Southern Hemisphere, it's from November to February.<|separator|>
[44]
2 Climatology of The Tropics - ScienceDirect.com
The tropics are between 23° 27' N and S of the equator, with high heat absorption. Key features include rainfall, climate, and air circulation.
[45]
Seasonal Swings in Tropical Rainfall - NASA Earth Observatory
Nov 26, 2007 · Not surprisingly, nearly two-thirds of all rain falls in the tropics, where incoming sunlight is steady year round. Sunlight evaporates water ...Missing: regions | Show results with:regions
[46]
Monsoons, ITCZs, and the Concept of the Global Monsoon - 2020
Oct 30, 2020 · Monsoons are a dominant feature of the tropical and subtropical climate in many regions of the world, characterized by rainy summer and drier ...Introduction · Idealized Modeling of Tropical... · Interpreting Observations and...
[47]
The Zonal Seasonal Cycle of Tropical Precipitation - AMS Journals
The intertropical convergence zone (ITCZ) is associated with a zonal band of strong precipitation that migrates meridionally over the seasonal cycle. Tropical ...
[48]
Dry and Wet Seasons in the Amazon Basin - MISR - NASA
Jul 24, 2021 · During the wet season, rainfall is greatest from December to May, and can exceed 8 inches (20 centimeters) per month. Over a year, the Amazon ...
[49]
What Are Monsoons and Why Do They Happen?
That's where rain is produced as warm and humid air rises in the Intertropical Convergence Zone (ITCZ), which swings north and south in a seasonal cycle, ...
[50]
Appendix 2: Köppen Climate Classification System – Physical ...
TROPICAL MOIST CLIMATES – “A” CLIMATES Annual precipitation is often greater than 1500 mm (59 in). Three minor Köppen climate types exist in the A group. These ...
[51]
Grand Average Precipitation Climatology (2000-2023) - NASA SVS
Mar 29, 2024 · The Grand Average Precipitation Climatology dataset takes the entire record of global precipitation from 2000 to 2023 and calculates the average precipitation ...
[52]
Evolution of the Atlantic Intertropical Convergence Zone, and the ...
Jul 9, 2022 · The ITCZ is typically defined as a band of enhanced tropical convection and precipitation within the axisymmetric overturning circulation of ...<|separator|>
[53]
State of the science on tropical cyclone frequency | NOAA Climate.gov
Nov 23, 2021 · On average there are about 80 tropical cyclones a year. The question scientists ask is: why 80? Will this number increase or decrease as the ...<|separator|>
[54]
Monthly Climate Reports | Tropical Cyclones Report | Annual 2022
A total of 88 named storms occurred across the globe in 2022, which was near the 1991-2020 average. Of those, 40 reached tropical cyclone strength (≥74 mph), ...Summary · East Pacific · Global
[55]
Monthly Climate Reports | Tropical Cyclones Report | Annual 2024
IBTrACS tropical cyclone track and intensity data from agencies and sources around the globe. In this report, data from NOAA's National Hurricane Center ...Summary · West Pacific · Global
[56]
[PDF] Significant Weather & Climate Events
Mar 18, 2025 · In total, there were 86 tropical cyclones in the. 2024 season1, with numbers close to average in both the Northern and Southern.
[57]
Global Warming and Hurricanes
Tropical cyclone intensities globally are projected to increase (medium to high confidence) on average (by 1 to 10% according to model projections for a 2 ...1. Summary Statement · B. Analysis Of Century-Scale... · C. Analysis Of Other...
[58]
Downward trends in the frequency of intense Atlantic hurricanes ...
This report provides such an analysis of the trends in Atlantic tropical cyclone frequency and intensity.1 Introduction · 2 Five Decade Long Trends · 3 Record Quiescent...
[59]
Billion-Dollar Weather and Climate Disasters
The US sustained 403 weather and climate disasters from 1980–2024 where overall damages/costs reached or exceeded $1 billion (including CPI adjustment to 2024).Events · Summary Stats · Time Series · Disaster MappingMissing: monsoons | Show results with:monsoons
[60]
Chapter 11: Weather and Climate Extreme Events in a Changing ...
The extremes considered include temperature extremes, heavy precipitation and pluvial floods, river floods, droughts, storms (including tropical cyclones), as ...
[61]
Tropical extreme droughts drive long-term increase in atmospheric ...
Here we show that tropical extreme droughts amplified the interannual variability in atmospheric CO 2 growth rate and drove the sensitivity change.
[62]
Impacts of droughts and heatwaves on river water quality worldwide
We find a general deterioration in river water quality under droughts and heatwaves globally for most rivers and water quality constituents considered.
[63]
Flash drought impacts on global ecosystems amplified by extreme ...
Jun 2, 2025 · We find that, when flash droughts are accompanied by extreme heat, they exhibit 6.7–90.8% higher severity and 8.3–114.3% longer recovery time than flash ...
[64]
The Five Major Types of Biomes - National Geographic Education
May 7, 2025 · There are five major types of biomes: aquatic, grassland, forest, desert, and tundra, though some of these biomes can be further divided into more specific ...
[65]
3.3 Terrestrial Biomes – Introduction to Environmental Sciences and ...
There are eight major terrestrial biomes: tropical rainforests, savannas, subtropical deserts, chaparral, temperate grasslands, temperate forests, boreal ...
[66]
https://www.britannica.com/science/tropical-rainforest
[67]
Tropical rainforest biomes (article) - Khan Academy
The tropical rainforest biome has four main characteristics: very high annual rainfall, high average temperatures, nutrient-poor soil, and high levels of ...
[68]
Tropical rainforests | WWF - Panda.org
Tropical forests cover just 6% of the planet's land surface but are some of the richest, most biodiverse places on Earth. They are home to ancient, ...<|separator|>
[69]
Tropical dry forest | Description, Biome, Ecosystem, Plants, Animals ...
Oct 11, 2025 · Tropical dry forests are found between 10° and 25° latitude and are often found north and south of the world's tropical rainforests.<|control11|><|separator|>
[70]
Extent and conservation of tropical dry forests in the Americas
Our findings show that tropical dry forests extend for 519,597 km2 across North and South America. Mexico, Brazil and Bolivia harbor the largest and best- ...
[71]
Tropical dry forests: The vanishing biome sustaining life
Sep 12, 2025 · With a tropical climate, seasonal rains, and open canopies, these ecosystems stretch across Latin America, Africa and Asia. In the Americas, up ...
[72]
Savanna - Grassland, Climate, Animals | Britannica
Oct 11, 2025 · Savannas grow in tropical regions 8° to 20° from the Equator. Conditions are warm to hot in all seasons, but significant rainfall occurs for only a few months ...
[73]
13.3: Savanna Biome - Geosciences LibreTexts
Feb 19, 2022 · The Savanna biome is characterized by an extensive cover of grasses with scattered trees. It is a transitional biome between those dominated by forests and ...<|separator|>
[74]
Tropical Savanna - Earth Floor: Biomes
Tropical Savannah The tropical savanna is a biome characterized by tall grasses and occasional trees. Large regions of tropical savanna extend through the ...
[75]
Mangroves | Smithsonian Ocean
A mangrove is a woody tree or shrub that lives along sheltered coastlines within the tropic or subtropic latitudes. In fact, the various species of mangroves ...
[76]
Mangrove Swamps | US EPA
Feb 5, 2025 · Mangrove swamps are coastal wetlands in tropical/subtropical regions with salt-loving plants in brackish to saline waters, often in estuaries. ...
[77]
Mangrove forests | UNEP - UN Environment Programme
Jan 20, 2025 · Specially adapted to living in salt and brackish water, mangrove trees are found along coasts and estuaries throughout 123 countries in the ...<|separator|>
[78]
Plant diversity in a changing world: Status, trends, and conservation ...
There are an estimated 500,000 species of land plants (angiosperms, gymnosperms, ferns, lycophytes, and bryophytes), with diversity strongly concentrated in the ...
[79]
Tropical Forests and Their Species Going, Going … - NCBI - NIH
Tropical forests, containing 50% of species, are being depleted rapidly, with 1% deforested yearly, and 75,000 species possibly already eliminated.Tropical Forests · Extinction Rates: Future · Tropical Forest And Climatic...<|control11|><|separator|>
[80]
The distribution of biodiversity richness in the tropics - PMC
There are also 4330 plant species shared uniquely between Tropical and Southern Africa. These figures demonstrate the well-known floristic richness of Southern ...
[81]
What are the most diverse plant families and why? Part One
Mar 6, 2025 · The five most diverse families (in order) include the Asteraceae (asters), Orchidaceae (orchids), Fabaceae (beans), Rubiaceae (madders), and Poaceae (grasses).Missing: biodiversity | Show results with:biodiversity
[82]
https://www.britannica.com/science/tropical-rainforest/Biota
[83]
Amazon plant diversity revealed by a taxonomically verified species ...
Sep 18, 2017 · More than one-half of seed plant species diversity in the Amazonian rain forests comprises shrubs, small trees, lianas, vines, and herbs (7,276 ...<|separator|>
[84]
Tropical Andes - Species | CEPF
The Tropical Andes is the world leader in plant endemism, with an estimated 50 percent (and perhaps 60 percent or more) of its species found nowhere else on ...Plants · Freshwater Fishes · Amphibians
[85]
Variation of floristic diversity, community composition, endemism ...
Jan 24, 2024 · Percentage of endemic species was greater in the lowland rainforests than in high-altitude montane forests. Nearly 85% of the species were ...
[86]
Consistent patterns of common species across tropical tree ... - Nature
Jan 10, 2024 · Extrapolating across all closed-canopy tropical forests, we estimate that just 1,053 species comprise half of Earth's 800 billion tropical trees ...
[87]
Exploring the floristic diversity of tropical Africa - BMC Biology
Mar 7, 2017 · Most species (91%) recorded in RAINBIO were able to be categorised into nine different growth form types (tree, shrub, herb, liana, vine, ...
[88]
Tropical Rainforest: Animals - Earth Floor: Biomes
Animal adaptation. Because there are so many animals competing for food, many animals have adapted by learning to eat a particular food eaten by no other animal ...
[89]
How have animals adapted to the rainforest environment?
Three-toed sloths have three extra neck bones, which allow them to turn their heads 270°, which is a useful adaptation when predators can come from any ...
[90]
Top 7 Tropical Rainforest Animal Adaptations | Biology Explorer
Feb 3, 2025 · 1. Camouflage ... The first and most common animal adaptation in a tropical rainforest is camouflage. For an animal to successfully exhibit this ...
[91]
Animal Adaptations - Teachers (U.S. National Park Service)
Oct 25, 2022 · Animal Adaptations – Quick facts · Having eyes on the sides of their heads allow deer to see in every direction except directly behind them.Missing: faunal | Show results with:faunal
[92]
A global assessment of endemism and species richness across ...
Endemism richness of plants and vertebrates is strongly related, and values on islands exceed those of mainland regions by a factor of 9.5 and 8.1 for plants ...
[93]
The distribution of biodiversity richness in the tropics - Science
There are also 4330 plant species shared uniquely between Tropical and Southern Africa. These figures demonstrate the well-known floristic richness of Southern ...
[94]
Endemism of woody flora and tetrapod fauna, and conservation ...
This study highlights the richness of endemic species of woody flora and tetrapod fauna, as well as addressing their threats and state of conservation.
[95]
State of the Tropics - Why do the tropics matter? - JCU Australia
Currently around 40% of the world's population live in the tropics. At current rates of population growth, by 2050, more than half of the world's people will ...
[96]
Enhancing Understanding of the Tropics: Australian University ...
Oct 28, 2022 · As of 2022, more than three billion people live in the Tropics – approximately 43% of the world's population. Importantly, it is also home ...
[97]
Habitability, the effect of climate type on population density - Geodiode
Oct 15, 2024 · The most densely populated zone, the Humid Subtropical is two million times greater in density than that of the least, the Icecap.
[98]
https://www.earthinstitute.columbia.edu/sitefiles/file/about/director/pubs/024.pdf
[99]
Key Facts and Statistics about the Tropical Zone of Earth
Jun 29, 2020 · Between 1980 and 2018, the proportion of people living in tropical cities increased from 30% to 47%, whereas the world's urbanization rate ...
[100]
Special Features of Urbanisation in Tropical Africa
Nov 11, 2008 · Africa is now ahead of all other continents in the rate of urban population growth, as indicated by Table I; this shows ten-year rates of growth ...
[101]
The current global distribution of coastal urban areas larger than...
The current global distribution of coastal urban areas larger than 100,000 people. Many of the largest cities are in lower income, tropical to subtemperate ...
[102]
Tropical fruits
FAO's latest forecast for cereal production in 2000 is 1 881 million tonnes, up 0.3 percent on last year. Output of wheat is forecast at 587 million tonnes, ...<|separator|>
[103]
Agricultural production statistics 2010–2023
Dec 20, 2024 · The global production of primary crops reached 9.9 billion tonnes in 2023, increasing by 3 percent since 2022 and 27 percent since 2010. The ...Missing: tropical | Show results with:tropical
[104]
STATISTICAL YEARBOOK WORLD FOOD AND AGRICULTURE 2024
Nov 15, 2024 · ABLE 19, the Americas was the leading region in the production of sugar cane (51 percent of the world total) and maize (50 percent) in 2022, ...
[105]
The impacts of shifting cultivation on tropical forest soil: a review
This practice physically exposes the soil for planting, eliminates competing plant cover, and improves soil fertility by leaving it less acidic and with a ...
[106]
Limited role of shifting cultivation in soil carbon and nutrients ...
Nov 30, 2022 · Our study suggests that shifting cultivation may not be detrimental to soil quality, at least on the soil parameters and soil type we studied in the ...
[107]
Drivers and consequences of archetypical shifting cultivation ...
Jan 24, 2023 · Shifting cultivation may degrade ecosystem services, such as soil fertility, when it is intensified with shorter fallows and frequently ...
[108]
[PDF] Shifting cultivation and tropical soils: patterns, problems, and ...
FAO (1957) has labeled shifting cultivation as the most serious land..use problem in the tropical world. Shifting cultivation has been condemned as ...Missing: challenges | Show results with:challenges
[109]
South America: Resources - National Geographic Education
Jun 4, 2025 · Other crops grown in the tropical regions include fruits, such as ... timber, oil, water, and food, to name a few. Because these basic ...
[110]
Which Continent Is The Richest In Natural Resources? - World Atlas
Aug 20, 2018 · Africa has the richest concentration of natural resources such as oil, copper, diamonds, bauxite, lithium, gold, hardwood forests, and tropical fruits.
[111]
Threats to Borneo forests | WWF - Panda.org
As in many tropical areas around the world, Borneo's rainforests are being cut and degraded for timber, palm oil, pulp, rubber and minerals.
[112]
Agriculture drives more than 90% of tropical deforestation | SEI
Sep 8, 2022 · The study makes clear that a handful of commodities are responsible for the majority of deforestation linked to actively producing agricultural ...
[113]
Disentangling the numbers behind agriculture-driven tropical ...
Sep 9, 2022 · 90% of deforested land occurred in landscapes where agriculture drove forest loss, but only about half was converted into productive agricultural land.
[114]
Tropical forests were the primary sources of new agricultural land in ...
This study confirms that rainforests were the primary source for new agricultural land throughout the tropics during the 1980s and 1990s. More than 80% of new ...
[115]
To tackle deforestation we need to focus on land use. Here's why
Sep 13, 2022 · Our review makes clear that between 90 and 99% of all deforestation in the tropics is driven directly or indirectly by agriculture. But what ...
[116]
Deforestation: causes and how the EU is tackling it | Topics
Feb 3, 2025 · Some 420 million hectares of forest were lost due to deforestation between 1990 and 2020, according to the UN Food and Agriculture Organization, ...
[117]
https://www.fao.org/newsroom/detail/global-deforestation-slows--but-forests-remain-under-pressure--fao-report-shows/en
[118]
Fires Drove Record-breaking Tropical Forest Loss in 2024
May 21, 2025 · Rates of non-fire related loss also increased by 13% in 2024 compared to 2023, but were still below peaks in the early 2000s and during ...
[119]
Global Forest Watch's 2023 Tree Cover Loss Data Explained
Apr 4, 2024 · The 2023 data shows a persistent rate of tree cover loss, measuring trees over 5m, with a 3.7% increase due to DIST-ALERT data. Amazon loss ...<|separator|>
[120]
10 Shocking Statistics About Deforestation - Earth.Org
Jan 21, 2023 · 95% of Deforestation Happens in the Tropics. 59% occurs in Latin America, 28% in Southeast Asia, and it happens in most part because of rich ...
[121]
Major Rainforests Target: End Deforestation by 2030
In the Congo Basin, deforestation rose by 12.5% in 2023 compared to the baseline from 2018-2020. Deforestation in the basin is increasing, meaning we are ...
[122]
Drivers of deforestation and degradation for 28 tropical conservation ...
Mar 9, 2020 · Commercial and subsistence agriculture were the main drivers of deforestation, followed by settlement expansion and infrastructure development.
[123]
The breakdown of ecosystem functionality driven by deforestation in ...
Deforestation leads to biodiversity collapse in remaining forest fragments. · Fragments in highly deforested landscapes present a reduce in forest quality.
[124]
Study Shows Impacts of Deforestation and Forest Burning on ...
Sep 1, 2021 · Since 2001, between 40000 and 73400 square miles of Amazon rainforest have been impacted by fires, affecting 95% of all Amazonian species ...
[125]
How does deforestation affect biodiversity? - Royal Society
Forest loss does not simply mean all biodiversity is wiped out, but it often results in a significant change in the mix of species that live there.
[126]
Tropical deforestation causes large reductions in observed ... - NIH
Mar 1, 2023 · A pan-tropical analysis using satellite, station-based and reanalysis datasets shows that deforestation causes reduced precipitation.
[127]
National policy reversals and deforestation in the Amazon - VoxDev
Apr 5, 2024 · Evidence from the Amazon highlights the crucial role of policy continuity and political commitment to achieving sustainable conservation outcomes.Missing: statistics | Show results with:statistics<|control11|><|separator|>
[128]
List of countries by oil production - Wikipedia
Under this definition (crude and condensate), total world oil production in 2023 averaged 81,804,000 barrels per day.
[129]
Crude oil production - World Energy Statistics - Enerdata
Overall, crude oil production declined in Saudi Arabia (-7% in 2024 after -9% in 2023), Russia (-3%), Kuwait and Algeria (-7% each), Kazakhstan, and the UAE. It ...
[130]
Oil Market Report - December 2023 – Analysis - IEA
Dec 14, 2023 · World oil demand is on track to rise 2.3 mb/d to 101.7 mb/d in 2023, but this masks the impact of a further weakening of the macroeconomic ...
[131]
[PDF] Cobalt Market Report 2023
In 2023, the global battery market entered the terawatt era whereby global production surpassed 1 TWh for the first time.Missing: bauxite | Show results with:bauxite
[132]
The race for critical minerals in Africa: A blessing or another ...
Investment in lithium saw the sharpest increase, reaching 50%, followed by copper and nickel (International Energy Agency, 2023). Critical minerals exploration ...
[133]
How much forest was lost in 2023? - Global Forest Review
Apr 4, 2024 · Total tropical primary forest loss in 2023 totaled 3.7 million hectares, the equivalent of losing almost 10 football (soccer) fields of forest per minute.
[134]
Palm Oil Industry Performance In 2023 & Prospects For 2024
Mar 1, 2024 · The production of crude palm oil (CPO) in 2023 was projected to reach 50.07 million tons or an increase of 7.15% compared to that of 2022 at 46.73 million tons.
[135]
[PDF] overview of the malaysian oil palm industry in 2023 - foreword
Exports of palm oil stood at 15.13 million tonnes in 2023 compared to 15.71 million tonnes in 2022. India maintained its position as the largest Malaysian palm ...
[136]
[PDF] Tropical Timber Market Report - ITTO
Mar 31, 2025 · The value of wooden furniture exports increased from. US$45.8 million in February 2024 to US$46.3 million in. February 2025, an increase of 1%.
[137]
[PDF] Geography and Economic Development
Among the tropical countries, the simple average of 1995 GDP per capita (not weighted by country population) is $3326. Among the non-tropical countries, the ...
[138]
[PDF] CID Working Paper No. 057 :: Tropical Underdevelopment by Jeffrey ...
Abstract. Most recent cross-country analyses of economic growth have neglected physical geography as a determinant of economic growth.
[139]
Why Tropical Countries are Underdeveloped | NBER
By 1992, GNP per capita in the tropical regions was 25 percent of that in the temperate-zone. Thus, between 1820 and1992, GNP per capita in the temperate region ...Missing: population | Show results with:population
[140]
Tropics, germs, and crops: how endowments influence economic ...
The purpose of this research is to assess empirically different theories of how geography, institutions, and policy influence economic development. The ...
[141]
[PDF] The Economic Growth Debate - Geography versus Institutions
They use the percentage of a country's land area located in the tropics as proxy for the climatic conditions of the country in question and test for the ...
[142]
[PDF] Further Evidence in Support of “The Tropical Effect”
The study finds empirical evidence suggesting that higher temperatures are negatively associated with the level of GDP per capita of a country. In addition, ...
[143]
[PDF] Reversal of Fortune: Geography and Institutions in the Making of the ...
This reversal weighs against a view that links economic development to geographic factors. Instead, we argue that the reversal reflects changes in the ...
[144]
[PDF] The Primacy of Institutions over Integration and Geography in ...
institutions-allows us to organize our thoughts on the "deeper" determinants of economic growth. These three are the factors that determine which societies will ...
[145]
Lost in the tropics: Sachs' misguided African geography - CEPR
Jun 1, 2009 · The debate on aid to Africa continues. This column argues that it is bad governments and institutions that cause poverty, not bad geography.<|separator|>
[146]
The world's most improbable success story still needs to evolve
May 9, 2024 · Singapore's GDP per person is an astonishing $88,000. Many of Singapore's strengths are still on display. Relatively few of its citizens died ...
[147]
Ravi Menon: An economic history of Singapore - 1965-2065
Aug 7, 2015 · In 1965, Singapore's nominal GDP per capita was around US$500. · In 1990, GDP per capita had risen to about US$13,000, surpassing South Korea, ...
[148]
How Lee Kuan Yew engineered Singapore's economic miracle - BBC
Mar 24, 2015 · Lee Kuan Yew performed a miracle transforming Singapore from one of the poorest countries in the world in the 1960s to being among the most advanced today.
[149]
How Singapore Became One Of The Richest Places On Earth - NPR
Mar 29, 2015 · Conservatives see Singapore as a free-market success story. Low taxes, few capital restrictions and liberal immigration policies have made it ...
[150]
How Lee Kuan Yew transformed Singapore | World Economic Forum
Mar 23, 2015 · Lee led Singapore after its separation from Malaysia to emerge as one of the world's most powerful financial centres.
[151]
Mauritius GDP Per Capita | Historical Chart & Data - Macrotrends
Mauritius GDP per capita for 2023 was $11,613, a 13.41% increase from 2022. Mauritius GDP per capita for 2022 was $10,240, a 12.91% increase from 2021.
[152]
[PDF] Mauritius: African Success Story - Harvard DASH
9 Probably the best interpretation of why tropical location seems to be bad for economic growth is the presence of malaria and other tropical diseases.<|separator|>
[153]
Finance & Development, December 2001 - Mauritius: A Case Study
But many of them failed where Mauritius succeeded. Clearly, there were deeper reasons for Mauritius's success. Institutions. To a considerable extent, strong ...
[154]
Inside Mauritius: The tropical paradise with a booming economy - CNN
Jan 22, 2015 · Despite the global slowdown in recent years, the Mauritian economy has consistently achieved annual growth rates of more than 3%, with ...
[155]
Mauritius: African Success Story | NBER
Despite its remote location, small size, and ethnic divisions, the Indian Ocean country has prospered compared with most other African nations.Missing: tropical | Show results with:tropical
[156]
Nigeria GDP Per Capita | Historical Chart & Data - Macrotrends
Nigeria GDP per capita for 2023 was $1,597, a 25.37% decline from 2022. Nigeria GDP per capita for 2022 was $2,139, a 6.05% increase from 2021.
[157]
A wealth of sorrow: why Nigeria's abundant oil reserves are really a ...
Nov 9, 2021 · It is known as the resource curse: assets that should bring wealth and stability but instead lead to corruption and poverty. And for Nigeria ...
[158]
Resource Curse Exacerbates Poverty in Nigeria - The Borgen Project
Aug 23, 2022 · Nigeria's resource curse leads the government to neglect other economic sectors such as infrastructure, industry, science/technology, services and agriculture.
[159]
[PDF] Addressing the Natural Resource Curse: An Illustration from Nigeria
We propose a solution for addressing this resource curse which involves directly distributing the oil revenues to the public. Even with all the difficulties ...
[160]
[PDF] Adapting the Singapore Model to Nigeria's Urban Management
This paper analyzes adapting Singapore's urban management model to Nigeria, where Singapore is a model for sustainable development, while Nigeria lags behind.
[161]
Neglected tropical diseases - World Health Organization (WHO)
Neglected tropical diseases (NTDs) are a diverse group of 20 conditions that are mainly prevalent in tropical areas, where they mostly affect impoverished ...
[162]
Malaria's Impact Worldwide - CDC
Apr 1, 2024 · Globally, an estimated 249 million malaria cases occurred in 2022, leading to 608,000 malaria deaths in a single year. Malaria is one of the ...<|separator|>
[163]
World Mosquito Day 2025 - A global health crisis
Aug 11, 2025 · 2024 was the worst year on record for dengue. More than 14 million cases were reported worldwide, with close to 12,000 dengue-related deaths.Missing: tropics | Show results with:tropics
[164]
Yellow fever - Region of the Americas
May 16, 2025 · The 212 confirmed yellow fever cases reported so far in 2025 represent a threefold increase compared to the 61 confirmed cases reported in 2024.Missing: malaria tropics
[165]
Common Infections | Parasites without Borders
Schistosomiasis transmission has been reported from 78 countries, and is prevalent in tropical and subtropical areas. It is estimated that at least 90% of ...
[166]
Tropical Infectious Diseases - In Her Lifetime - NCBI - NIH
Of the tropical infectious diseases discussed in this chapter, five are life-threatening: malaria, schistosomiasis, African trypanosomiasis, onchocerciasis, and ...
[167]
Chagas Disease, an Endemic Disease in the United States - CDC
Aug 13, 2025 · Chagas disease, caused by Trypanosoma cruzi parasites, is considered endemic to 21 countries in the Americas, excluding the United States.
[168]
Impacts of environmental and climatic changes on future infectious ...
Jan 24, 2023 · Environmental factors such as temperature, rainfall, and humidity consequential of climate changes globally pose a significant impact on many ...
[169]
Impact of recent and future climate change on vector‐borne diseases
Climate directly impacts health through climatic extremes, air quality, sea‐level rise, and multifaceted influences on food production systems and water ...
[170]
Environmental Determinants of Infectious Disease: A Framework for ...
For example, climate change may impact the characteristics of El Niño, roads may contribute to urbanization, deforestation may amplify climate change, and the ...
[171]
Socioeconomic Inequalities in Neglected Tropical Diseases
May 12, 2016 · Poverty is usually seen as a root cause of NTDs because of its association with living and working conditions and access to preventive and ...
[172]
Neglected tropical diseases - World Health Organization (WHO)
Jan 8, 2025 · They thrive in areas worsened by climate change and where access to clean water and sanitation is scarce. Furthermore, NTDs tend to affect ...
[173]
Demographic, socioeconomic and environmental changes affecting ...
It was found that poverty, unregulated urbanization and inadequate sanitation are important socioeconomic factors that have great effect on the transmission ...
[174]
https://journals.plos.org/plosntds/article?id=10.1371/journal.pntd.0011457
[175]
Socio-economic and environmental factors associated with high ...
Jul 11, 2023 · Results found that high risk populations were those living in rural areas, employed in agriculture, with high levels of poverty, and houses without electricity ...
[176]
Assessing the Burden of Neglected Tropical Diseases in Low ... - MDPI
In addition to access to healthcare, socioeconomic factors play a crucial role in perpetuating the burden of NTDs [8]. Poor sanitation and hygiene, along with a ...
[177]
Insecticide-Treated Nets | Malaria - CDC
Apr 2, 2024 · In community-wide trials in several African settings, ITNs reduced the death of children under 5 years from all causes by about 20%.Missing: artemisinin | Show results with:artemisinin<|separator|>
[178]
Comparing the Impact of Artemisinin-Based Combination Therapies ...
Artemisinin-based combination therapies (ACTs) are currently considered the first-line treatments for uncomplicated Plasmodium falciparum malaria.
[179]
Impact of Artemisinin-Based Combination Therapy and Insecticide ...
Nov 6, 2007 · Conclusions. Following deployment of ACT in Zanzibar 2003, malaria-associated morbidity and mortality decreased dramatically within two years.
[180]
Schistosomiasis and neglected tropical diseases: towards integrated ...
We clarify that schistosomiasis is only one of many neglected tropical diseases and that considerable uncertainties remain regarding global burden estimates.
[181]
Vaccines and immunization: Dengue
Apr 10, 2025 · Currently, only one vaccine is available for dengue prevention. WHO recommends the use of Q-denga® (TAK-003) in children aged 6–16 years in settings with high ...
[182]
Chikungunya vaccine development, challenges, and pathway ...
Dec 2, 2024 · This article describes the chikungunya vaccine pipeline and assesses the challenges in the path to licensure, access, and uptake of chikungunya vaccines in ...
[183]
Chikungunya's 2025 surge sparks urgent research response
Aug 22, 2025 · The 2025 chikungunya outbreak spans 119 countries, driving urgent research into vaccines, antivirals and diagnostics.
[184]
https://www.who.int/news/item/24-04-2024-global-immunization-efforts-have-saved-at-least-154-million-lives-over-the-past-50-years
[185]
Global immunization efforts have saved at least 154 million lives ...
Apr 24, 2024 · A major landmark study to be published by The Lancet reveals that global immunization efforts have saved an estimated 154 million lives.
[186]
Progress Toward Poliomyelitis Eradication - CDC
May 16, 2024 · In 1988, poliomyelitis (polio) was targeted for eradication. Global efforts have led to the eradication of two of the three wild poliovirus (WPV) ...
[187]
Threats to the effectiveness of insecticide-treated bednets for ...
Jun 30, 2021 · From 2004 to 2019, insecticide-treated bednets (ITNs) have been the most effective tool for reducing malaria morbidity and mortality in sub-Saharan Africa.
[188]
Tropical Diseases and Schistosomiasis - ResearchGate
Jul 20, 2025 · Introduction: Schistosomiasis, a tropical disease affecting humans and animals, affected 251.4 million people in 2021. Schistosoma mansoni ...
[189]
The impact of an insecticide treated bednet campaign on all-cause ...
Feb 22, 2019 · We find that the campaign led to a 41% decline [3.7 percentage points, 95% CI 1.3 to 6.0] in under-5 mortality risk among children living in rural areas.
[190]
OTH004659 - Climatology (ERA5) | Climate Change Knowledge Portal
This page presents OTH004659's climate context for the current climatology, 1991-2020 and historical record from 1950-2023. Data is derived from ERA5 ...
[191]
Global Temperature Report for 2023 - Berkeley Earth
Jan 12, 2024 · 2023 was the warmest year on Earth since direct observations began, and the first year to exceed 1.5 °C above our 1850-1900 average.
[192]
Global Climate Highlights 2023 | Copernicus
Jan 9, 2024 · The temperatures observed in the later months of 2023 were not only record high relative to the average for 1991-2020, but also relative to a ...
[193]
Global Precipitation Means and Variations: The New Version of GPCP
The new GPCP V3.2 has increased ocean mean values, a 4.5% increase in global precipitation, and a near zero trend, with positive trends in the deep tropics.
[194]
Precipitation Intensity Changes in the Tropics from Observations and ...
Tropical (30°N–30°S) interdecadal precipitation changes and trends are explored for the satellite era using GPCP monthly analyses and CMIP5 outputs.
[195]
Climate Variability of Tropical Cyclones: Past, Present and Future
Concurrent with these frequency changes, there have been periods of strong mean intensity of the Atlantic tropical cyclones (mid-1940s-1960s and 1995-1996) ...
[196]
Intensity of tropical cyclones is probably increasing due to climate ...
“The intensity of tropical cyclones has increased globally in recent decades, with the proportion of Category 3 to 5 cyclones growing by around 5% per decade ...
[197]
Observed increases in North Atlantic tropical cyclone peak ... - Nature
Oct 19, 2023 · Mean maximum TC intensification rates are up to 28.7% greater in a modern era (2001–2020) compared to a historical era (1971–1990).
[198]
Trends in Global Tropical Cyclone Activity: 1990–2021 - AGU Journals
Mar 14, 2022 · This study investigates global tropical cyclone (TC) activity trends from 1990 to 2021, a period marked by largely consistent observational platforms.
[199]
The Impact of Natural and Anthropogenic Climate Change on ...
To analyze the relative influence of natural and anthropogenic climate variability on TC track changes due to changes in the large-scale steering flow and ...
[200]
How well have CMIP3, CMIP5 and CMIP6 future climate projections ...
Jul 14, 2022 · This study presents a comparison between CMIP3, CMIP5 and CMIP6 future temperature projections and observations.
[201]
[PDF] Distinguishing the roles of natural and anthropogenically forced ...
Capsule: In decadal forecasts, the magnitude of natural decadal variations may rival that of anthropogenically forced climate change on regional scales.
[202]
Variations in atmospheric CO2 growth rates coupled with tropical ...
Here we show a strong and persistent coupling (r 2 ≈ 0.50) between interannual variations of the CO 2 growth rate and tropical land–surface air temperature ...
[203]
[PDF] Divergent global precipitation changes induced by natural versus ...
As a result of global warming, precipitation is likely to increase in high latitudes and the tropics and to decrease in already dry sub- tropical regions1.
[204]
Detection, attribution, and modeling of climate change: Key open ...
May 13, 2025 · This paper discusses a number of key open issues in climate science. It argues that global climate models still fail on natural variability at all scales.
[205]
An update on the influence of natural climate variability and ...
Future changes in tropical cyclone intensity and frequency over the western North Pacific based on 20-km HiRAM and MRI models. J. Clim., 34 (2021), pp. 2235 ...<|separator|>
[206]
Exploring the Interplay between Natural Decadal Variability and ...
There has been considerable debate about whether this trend is a signature of anthropogenic climate change associated with increases in both greenhouse ...
[207]
Debates on the Causes of Global Warming - ScienceDirect.com
Mar 25, 2012 · IPCC holds that today's global warming is mainly due to anthropogenic activities rather than natural variability, which is emphasized by NIPCC.
[208]
Climate Change Resilience and Sustainable Tropical Agriculture
We have categorized 15 adaptation strategies into 6 main categories, as described previously. Farmers have devised a variety of adaptation measures to cope with ...2. Methodology · 2.4. 2. Farmers' Knowledge... · 3. Results
[209]
Climate adaptation and resilience in tropical drylands (CLARITY)
The CLARITY project integrates gender and inclusion perspectives into climate resilience through disaggregation and downscaling of models.
[210]
Progress and gaps in climate change adaptation in coastal cities ...
Aug 26, 2024 · This paper systematically assesses the academic literature to evaluate evidence on climate change adaptation in 199 coastal cities worldwide.
[211]
How are developing countries adapting to climate change? - VoxDev
Jun 28, 2023 · What we know about the effectiveness of different adaptation responses to climate events, including financial products, new technologies ...Missing: studies | Show results with:studies
[212]
A good idea or just an idea: Which adaptation strategies for ...
Adaptation strategies to improve biodiversity outcomes are largely untested. Only 14 studies were identified in which adaptation efficacy was tested.
[213]
Are climate change adaptation strategies interrelated? Evidence ...
Recent empirical evidence shows that joint adaptation strategies significantly increase productivity, net income, and resilience to climate change impacts ( ...
[214]
Misinformation in the IPCC - by Roger Pielke Jr. - The Honest Broker
Mar 29, 2023 · I explain how the IPCC made several misleading claims related to tropical cyclones. The IPCC's failures are both obvious and undeniable.
[215]
How Climate Scenarios Lost Touch With Reality
A failure of self-correction in science has compromised climate science's ability to provide plausible views of our collective future.
[216]
The Responses of Tropical Forests to Global Warming - YouTube
Mar 9, 2023 · ... adaptation or acclimation ... 105 views · 54:10. Go to channel · Agriculture Impacts Greenhouse Gas Emissions from Canadian Prairie Wetlands.Missing: skeptical | Show results with:skeptical
[217]
[PDF] Adaptation to climate change and economic growth in developing ...
Developing countries are vulnerable to the adverse effects of climate change, yet there is disagreement about what they should do to protect themselves from ...
[218]
[PDF] Climate Change: Addressing the Major Skeptic Arguments
Furthermore, new measurements in the tropics suggest greater warming in the upper troposphere than at the surface, as predicted by the models. Although the ...
[219]
[PDF] Climate Adaptation in Developing Countries:
Although adapting to climate change can make business sense, a number of barriers hinder the private sector's ability and motivation to undertake adaptation ...<|separator|>
[220]
[PDF] Deconstruction of Colonial Discourse Through Tropical Invalidism
Robinson Crusoe. In Robinson Crusoe, Defoe gives a grim portrayal of the tropical climate which draws the protagonist into failing physical and psychological ...
[221]
[PDF] The tropical forest as symbol and setting in the fiction of Joseph ...
This thesis explains the prevalence and meaning of the tropical forest image in British fiction during the period 1885 to 1914, referring in particular to ...
[222]
Representations of Tropical Forests and Tropical Forest-Dwellers in ...
This essay examines the dominant images of rainforests and rainforest peoples portrayed in accounts of travels in tropical America published in National ...
[223]
Gabriel García Márquez and Colombian Literature | Terra Colombia
It is in the tropical atmosphere of this northern Colombian town, surrounded by banana plantations, that Gabriel García Márquez drew much of his inspiration ...
[224]
Surveying the American Tropics: A Literary Geography from New ...
Tropical nature evokes a distinctive kind of geographical setting with its own characteristic flora and fauna.¹ Its representation, however, has been varied, ...
[225]
"Godzilla vs. Kong": Monster movies evoke adventure but also ...
Apr 10, 2021 · Hollywood movies have historically represented the tropics as lush green coasts but lurking underneath is danger.
[226]
Heart of Darkness Part 1 Summary & Analysis - LitCharts
Need help with Part 1 in Joseph Conrad's Heart of Darkness? Check out our revolutionary side-by-side summary and analysis.
[227]
[PDF] Hollywood's Tropical Backlot - FilmHawaii
Hawaii is the only US state with tropical locations, doubling for remote areas like Africa and South America, and is known as "Hollywood's Tropical Backlot".
[228]
Beyond Paradise? Retelling Pacific Stories in Disney's Moana - jstor
The trope of paradise has figured prominently in filmic representations of the Pacific. Images of sparkling azure waters lapping against pristine.
[229]
[PDF] The Colonial Origins of Comparative Development - MIT Economics
these areas in the tropical zone were richer and more densely settled in 1500 than the temperate areas later settled by the Europeans. This also supports ...
[230]
The economic impact of colonialism - CEPR
Jan 30, 2017 · In our research with Simon Johnson we have shown that colonialism has shaped modern inequality in several fundamental, but heterogeneous, ways.
[231]
The Economic Impact of Colonialism | World Development - UZH
The main arguments regarding the economic impact of colonialism are the 'drain of wealth', expropriation (mainly of land), the control over production and ...
[232]
The cash crop revolution, colonialism and economic reorganization ...
We find that colonial cash crop production had positive long-run effects on urbanization, road infrastructure, nighttime luminosity, and household wealth.
[233]
[PDF] Colonialism and Modern Income – Islands as Natural Experiments
Our results show that islands with a longer colonial history (and more settlement by Europeans) have higher income per capita and lower infant mortality than ...
[234]
[PDF] THE ENVIRONMENTAL AND SOCIO-ECOLOGICAL IMPACT OF ...
After European contact and the 'Great Dying,' the estimated population was reduced by 90% with an interquartile range of (87-92%), or roughly. 54.5 million ...