Azul Thome, the co-founder of 'Food from the Sky,' stands in the roof garden above a supermarket in Crouch End in London, England. The roof gardens produce is sold in the Budgens supermarket below it. (Photo by Oli Scarff/Getty Images)
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Seen as a positive force for the environment as well as a great way to save money by growing your own dinner, rooftop gardens are blooming in cities over the globe from the WWF building in Washington D.C. to London's East End.