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Vertical farming grows crops in stacked indoor layers under tuned electric lighting, often inside converted warehouses in city centres. Because the environment is controlled, growers can harvest leafy greens all year, untroubled by weather or season. These farms use far less water than open fields, since irrigation runoff is captured and recirculated. Their main drawback is the heavy electricity demand of artificial light, which can make produce costly unless renewable power is cheap. For now, the method suits high-value salad crops rather than staple grains, whose low price per kilogram cannot cover the running costs.