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I am a fish vegetarian that quit eating meat, partly for ethical reasons and partly environmental.
It is always funny to see the fulminations of the American greedy when their beef is threatened, as you see here in the letters column. This article, while making fun of PETA in the headline, actually embraces their main point, which was also made by "Diet for a Small Planet" ... in 1970. I have stopped drinking milk and gone to soy. But eggs are a product of chickens, not cows, which is the only mistake I see in this article.
The development of oil-driven agriculture is what has lead to the large population rise. This agriculture has given a turbo boost to meat production at the same time. That and the idiocies of various religions, which oppose birth control methods, have lead to far higher populations.
People who want a 'die off' are not much different from Nazis. Peak oil will shut off the petro-agriculture so much of the world lives on. It will work to reduce populations. To avoid mass starvation, birth control has to be promoted and a sustainable agriculture, done most notably now by Cuba, has to be developed - now.
Living the way we do now is over. Chuckling about the Hummer PETA was using (sarcasm on their part?) doesn't suffice.