The global livestock sector accounts for 14.5% of man-made greenhouse gases, more than all of the world’s automobiles, the United Nations has reported. Of that, nearly 40% is methane gas produced by digestion in cattle. The rumen, the first of four parts of a cow’s stomach, contains bacteria that ferment the high-fiber grass, hay and grains they eat. During this process, a combination of gases forms methane, which the animals emit mostly by burping and exhaling, but also in their flatulence and manure.
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