With the fate of human civilization allegedly hanging in the balance, is this answer good enough?

SFGate: Politics Blog : Pelosi Brings Surprise Guest: Al Gore-- Meat-Eating Carbon Machine --to Netroots Nation

Our favorite question: If meat causes more carbon emissions than cars, what should we do?

Al said, "It is true that it would be healthier for us as if we consumed less meat." How come that hasn't been a more prominent? "I myself am a meat eater and perhaps that has something to do with it." We've got to walk before we run, Al said. "None of us are perfect."