Most of the food crops raised in the world today are fed to livestock destined for slaughter for us to eat, and most of the water used is used to raise the food crops that are fed to those animals. It has been estimated that, because of the extraordinary amount of grain it takes to raise food animals, if we reduced the amount of meat we eat by only ten percent, that would free up enough grain to feed all the starving humans in the world. So when we choose to eat meat instead of vegetables, we are choosing to take food away from others who are hungry.