Carbon Footprint: SUVs vs. Cows

I am glad to be able to link Dr. Free-Ride in today's carbon footprint entry - mostly because today is a 'get your dissertation talk ready' day. She follows up (probably unknowingly) on my entry last week about cow farts with a well thought-out post comparing the switch from an SUV to a compact car with switching from meat to veggies for protein. In reality, she is responding to an interesting but scientifically uncritical analysis of the situation recently printed in the NYTimes.