[AlexandrB]

Ruminant grazing on natural grasslands is not sufficient to meet the demand for meat. This is why chunks of the Amazon are burned down to create more land for raising livestock. And raising crops for people is much more efficient (in terms of calories per acre) than raising those same crops for animals. Any arguments highlighting the destructive effects of industrial crop farming apply ~10x for meat since much of the meat we eat is raised on soy and other feed crops.