One acre of land planted in legumes provides 10 times more available protein than the same acre used for meat production. Endangered wilderness areas in Alberta are also destroyed by cattle grazing and the deforestation of land to create new grazing space. One acre of trees is spared each year by a person on a pure vegetarian diet. Methane is a greenhouse gas. Cattle are one source of this gas.
The Amazon Rainforest is also being clear cut in order to raise cheap crops (to feed animals destined for the fast food industry) or to raise cattle (also for the fast food industry). Learn more about this issue at the (Bio)DaVersity Code website (notably the section on the Amazon Rainforest).