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I've been saying this (and pissing people off) for years: if you eat a meat-based diet then deal's off - just shut your yap about being an enviromentalist. You do NOT need to eat meat. It's a choice, just like the car you drive or how many lights are on in your house.
...so if the entire U.S. population went vegan, we'd reduce our greenhouse gas emissions by only 6 percent.
That's actually a pretty good number, especially since it asks you to simply avoid an action that can be easily avoided. Do that and take public transportation and now you're up to 15 percent. Lookin' good veggie boys and girls!