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Above the streets of New York, a new generation of farmers is doing something productive in spaces that normally go to waste.   One organic field (750 square metres) overlooking Manhattan is 15 metres above the Greenpoint sidewalk in Brooklyn. This is the first commercial rooftop agricultural venture in North America.   Locally produced food, green rooftops and a growing appetite for quality cuisine is blossoming in New York City.   euronews knowledge brings you a fresh mix of the world's most interesting know-hows, directly from space and sci-tech experts. Subscribe for your dose of space and sci-tech (every Monday, Wednesday and Friday) http://eurone.ws/Y9QTy3 Made by euronews, the most watched news channel in Europe.