Vertical farming
Vertical farming is an indoor method of crop production that stacks plants in vertical layers, typically employing soilless systems such as hydroponics, aeroponics, or aquaponics within controlled environments to maximize yield per unit area.[1] This approach leverages artificial lighting, precise nutrient delivery, and climate regulation to enable year-round cultivation independent of external weather or soil conditions.[2] Proponents highlight its capacity to reduce water usage by 70 to 95 percent and land requirements by over 90 percent compared to traditional field farming, facilitating localized food production in urban settings and minimizing transportation emissions.[3] However, vertical farming's high energy demands—primarily for LED lighting and HVAC systems—often result in energy conversion efficiencies of only 1 to 2 percent from electricity to food calories, rendering it economically unviable for staple crops without abundant renewable power sources.[4] Critics note that reliance on grid electricity can elevate carbon footprints beyond those of conventional agriculture, particularly for non-leafy greens, with life-cycle assessments revealing substantial environmental trade-offs despite resource efficiencies in water and land.[5] While early adopters have achieved commercial success with high-value produce like herbs and microgreens, scalability remains constrained by capital-intensive setups and operational costs, prompting ongoing research into hybrid models and precision technologies to enhance viability.[6]