Something to consider as well is how much fuel and energy is actually used to “bounce around” from local markets trying to track down local foods. It may be fine if you can walk to each market or store. However, it has been suggested that the pollution caused from the drive to several markets that sell local food (compared to driving to the nearest supermarket) may accumilate to a value greater than what is caused from importing the goods.

A supermarket may use one truck to drive the strawberries in from California, but the additional distance traveled by all the consumers to get those strawberries locally may exceed that.

Unfortunately, I cannot remember where this article is so I cannot provide reference.