The front page Washington Post article this last Sunday has made me seriously think about the things I can do to minimize my impact in this area. One thing that I'm thinking a lot about, which you neglected to mention, is the virtues of eating lower on the food chain (as well as eating locally and less processed foods, as you suggest). A lot more energy and food is diverted to feed livestock, in particular, for our consumption. I think we'd have a healthier planet, healthier diets, and less strain on food and energy sources if we all ate a little lower on the food chain.