Google on "Meatless Monday", it is an international effort to get people to eat meatless for one day a week ( Monday ) to reduce pollution and other environmental problems. For example, for one day a week have cereal for breakfast, A PB & J and Banana sandwich for lunch and a plate of pasta for dinner.
I've seen various articles that doing ONLY Meatless Monday helps the environment more than being a pretentious "locavore" all week long.
If you are interested in more information about the connection between good choices and the environment here are some short articles:
% "Every morning, I get up and look through the 'Forbes' list of the richest people in America. If I'm not there, I go to work" -- Robert Orben