Read other letters about this article
Global warming is a technical problem not a moral one. It's a solvable problem, and the point is to reduce greenhouse gases. It's completely irrelevant how they are reduced, be it by alternative energy, more efficient or reduced consumption. This does not require us to reduce our consumption to zero, or to try and come close to it. Pretending it would is only helping to convince people that there is nothing they can do, or to cause them to resort to delusions ("it's a worldwide conspiracy of thousands of top scientists").
So if you think being vegetarian is morally superior - fine, you are welcome to your beliefs. However PETA's nonsense propaganda actually hurts our efforts to combat climate change, and that's not moral behaviour.