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they are saying that those who don't eat meat have to over compensate for protein by eating more eggs and dairy than they otherwise would. thus eating chicken is more effecient in terms of greenhouse gas production than eating more eggs and dairy.
well, I feel a lot better after reading this. living in nyc I rarely drive anywhere. I guess I will try to cut down on red meat, which I should do anyway. but sounds like what we thought was the problem really is: the combustion engine and other ways of burning fossil fuels.
Does PETA really care about global warming? they are really just conceened about animals, not humans.