Study shows how urban land could feed a city

The UK’s University of Sheffield recently published an article in Nature Food with statistics showing that 45% of the city of Sheffield is green space that could theoretically be converted to arable production, providing food for 122% of the city’s residents. More realistically, current allotments, plus 10% of home gardens and 10% of green space, could feed 15% of the city. I wonder how this compares to Fremont? Anyone willing to pencil out the numbers?

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