Eighty percent of grain grown in the U.S. and about half the fish hauled in are wasted to grow billions of animals big and fat enough to be profitably slaughtered, or to produce dairy products and eggs at the high levels demanded by consumers. And over ninety percent of the protein in this grain turns into the methane, ammonia, urea, and manure that pollutes our air and water. A conservative estimate is that the amount of land, grain, water, petroleum, and pollution required to feed one of us the Standard American Diet could feed fifteen of us eating a plant-based diet.