A few McCartney's (Paul, Stella, Mary) have created a wonderful organization called Meat Free Monday to help educate folks on the environmental impact of our crazy carnivorous consumer culture. What I like about Meat Free Monday is that the concept isn't about deprivation, it's about a conscious and careful effort at reduction. It's not throwing meat entirely out of your life, it's about not eating meat one day a week, a chance to make a commitment and reflect on how we fill our bodies.
Check out the Meat Free Monday Website. They've got great information on ways reducing meat can aid in CO2 reduction, recipes, resources, etc. And have a Happy Monday!