Yes. We feed so much grain to animals in order to fatten them up for consumption that if we all became vegetarians, we could produce enough food to feed the entire world. In the U.S., animals are fed more than 80 percent of the corn we grow and more than 95 percent of the oats. The world's cattle alone consume a quantity of food equal to the caloric needs of 8.7 billion people—more than the entire human population on Earth. Click here for more on meat and the environment.