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Because it's mainly due to how the feed they eat is digested. The digestive processes both from the rumen and from the cecum encourage byproduct which includes methane and carbon dioxide. Since these gases don't have anything to contribute to the health of the animal, they are expelled by belching and flatulence. And methane isn't just from cows: it also comes from humans, pigs, deer, horses, sheep, wolves, lions, etc. It also comes from deep in the earth and is expelled into the atmosphere.

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