How Urban Farming With Hydroponics Can Help Feed the World While Saving Water

Unlike a traditional farm, the sprouting plants here grow without soil. They flourish atop vast racks with water trenches running through them that are slightly angled so that gravity helps the irrigation water shuttle around the closed system, instead of using energy-sucking pumps to move water around. Nutrients that the plants need are dissolved into the water, which comes from the local municipality’s supply. Any water runoff is purified, nutrient re-enriched, and released back into the channels.