Vegetarianism helps Global Warming

Here is a cool news story and is a no brainer about environmental benefits of vegetarianism. Sometimes I do wonder that at the rate that we are going, what would happen when humans have eaten or destroyed all of the creatures of this earth? What would we eat next? It is a sickening thought, but has some truth in it. On the other hand, imagine if everybody just grew trees and ate fruit, nuts and vegetables etc.