Vertical farming technologies may some day provide food for billions of urban dwellers, according to proponents of high-rise agriculture. By 2050, there will be 3 billion more people on the planet, and 80% them will live in urban centers -- and all of them will require food. Meanwhile, the amount of arable land per person is decreasing rapidly, sparking interest in building multilevel, vertical farms that use much less land and water than conventional farms and can be built in urban areas.

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