By Brendan I. Koerner for Slate.com on 23 Oct 2007
As a longtime vegetarian, I've always been confident that my diet is better for the planet than that of your typical carnivore. But a vegan pal of mine says I could be doing a lot more, by rejecting all animal products—no eggs, no milk, not even the occasional bowl of mac 'n cheese. Is veganism really that much better for the environment?
