Using Figure 10 and Table 1,
Kremer and DeLiberty frugally calculated that if “just 5% of the available land was cultivated in the city of Philadelphia, with a conservative average yield of 0.6 pounds/sq. ft, over 9.9 million pounds of food would be produced annually, as locally as food can be grown.” This would allow the urban areas of Philadelphia to have a higher access to local food products, therefore reducing the negative health and environmental effects associated with the previously consumed high “food mileage” products.
Kremer, P., & DeLiberty, T. L. (2011). Local food practices and growing potential: Mapping the case of Philadelphia. Applied Geography, 31(4), 1252-1261.