I'm fascinated by food trends and issues of agricultural policy, and as someone who dreams of someday becoming a yeoman farmer himself, these are not purely abstract concerns. The "locavore" movement is certainly good news to one who hopes to be able someday to market the produce of a small, diverse operation. So it's not with great enthusiasm that I agree with the analysis that several of the primary reasons people cite for buying local really don't add up, namely the environmental and food-security. Here, a small local producer explains why the "buy local" food movement is just another sentimental feel-good trend, and why it would be an environmental disaster if it were actually embraced throughout the culture.
In short, the energy costs of agriculture and food shipment and processing are really quite small: we Americans use more energy powering our televisions than producing the food we eat. Without question the most significant environmental burden of our food production system is the sheer amount of land it takes up, so making a marginal reduction in the already-tiny transport costs at the expense of using more land is hardly a win for the environment.