How Google Earth Revealed Chicago's Hidden Farms

When scientists scoured lists of the city's community gardens, they discovered they didn't tell the whole story of where food was being grown. Satellite images instead show the city's food-producing gardens tucked away in backyards, on roofs and thriving in vacant lots.

Source: http://www.npr.org/blogs/thesalt/2013/01/08/168895084/finding-chicago-s-hidden-farms?ft=1&f=100

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