Daniel Shea has spent some time in the last six months photographing food deserts in Chicago [ht:ba]. He also writes that
As the earth’s soil erodes due to intensive slash and burn agriculture, overpopulation and ground water depletion, desertification takes place. Literally, the world is turning into a desert. A similar phenomenon plagues cities, but instead of soil erosion, the urban dweller finds resource erosion, and for the focus of this project, the resource is food. Food deserts are concentrated regions where residents have little to no access to fresh and sustaining foods. This occurrence is particularly prevalent in the city of Chicago.