If Manhattan Borough President Scott Stringer has his way, a new kind of skyscraper will one day join the New York skyline -- one that produces enough food to feed 50,000 people. Within several months, Stringer plans to forward to the mayor's office a feasibility study for a vertical farm, a concept pioneered by Dickson Despommier, a professor at Columbia University. Despommier says NASA research on hydroponic vegetables proves a 30-story tower could produce food using solar, wind and wastewater for power.

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