(Business 2.0 magazine) -- The term "urban farming" may conjure up a community garden where locals grow a few heads of lettuce. But some academics envision something quite different for the increasingly hungry world of the 21st century: a vertical farm that will do for agriculture what the skyscraper did for office space.
Build a 21-story circular greenhouse, says Dickson Despommier, an environmental science professor at Columbia University, and it can be as productive as 588 acres of land - growing, say, 12 million heads of lettuce a year.
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