Cows, sheep, and other ruminants end up looking so bad in part because they eat a lot more, pound for pound, than their single-stomached brethren: That means more fertilizers, more pesticides, and more energy are required to grow their food. (The livestock industry as a whole consumes a whopping share of the world's crops--at least 80 percent of all soybeans and more than half of all corn.) One bright side: Ruminants' hardy stomachs can digest cellulose, which means they can graze on grassland other animals can't.
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