40 Percent Of The World’s Cropland Is In Or Near Cities

National Public Radio: Urban agriculture is clearly taking off around the world - in backyards, on rooftops and on local farms. But just how much of the world's cropland can we really call urban? That's been a big mystery. Now, a study published in the journal Environmental Research Letters has an answer: Somewhere around 1.1 billion acres is being cultivated for food in or within about 12 miles (20 kilometers) of cities. Most of that land is on the periphery of cities, but 16.6 percent of these urban farms are in......

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