I've been listening to this really fascinating podcast series from Princeton's Food Ethics and the Environment conference.
Today, in part 3, I learned that a person who normally gets about a third of their calories from red meat (average for most Americans) is responsible for 2.5 times the greenhouse gases (created during production) when compared with a vegan person. This is roughly the equivalent of the difference between driving a SUV versus a Camry.
Simply amazing. I'd highly recommend the series for anyone who likes some background education during their workday. Or even at home.