Add Yahoo as a preferred source to see more of our stories on Google. The cow’s amazing ability to sustain itself by eating nothing but grass is one of the marvels of nature, but it comes at a cost.

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A Jersey cow feeds in a field on the Francis Thicke organic dairy farm in Fairfield, Iowa, May 8, 2018. Let’s clear the air about cow farts. In the climate-change debate, some policy makers seem to be ...

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The cow’s amazing ability to sustain itself by eating nothing but grass is one of the marvels of nature, but it comes at a cost. As grass ferments in the rumen — one of four compartments in the animal ...