The impact of meat on global warming

Time magazine has a great article on how meat makes global warming worse:

In a 2006 report, the U.N. Food and Agriculture Organization (FAO) concluded that worldwide livestock farming generates 18% of the planet's greenhouse gas emissions — by comparison, all the world's cars, trains, planes and boats account for a combined 13% of greenhouse gas emissions.

I've written a few things on my experiment with complete meatlessness, and how one of my motivations is the environmental impact of raising cattle. As of a few months ago, I started eating white meat again. I never plan to eat pork or beef again regularly, although there will probably be times when I'm trapped somewhere and all they offer is BBQ or something. On the ethics, I suppose I just don't think that birds have the same sort of conscious awareness as mammals like pigs and cows do.