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Vegetarianism as a moral philosophy has been around for thousands of years, far longer than the present issue of global warming. Regardless of the meat industry's contribution to global warming, there still remains the underlying and more fundamental question of choosing to kill animals for food. One does not need to eat meat in order to live well, therefore, faced with the choice of taking the life of an animal, or showing mercy and letting that animal live, vegetarianism is the right thing to do.