Factory Farming and the Environment Factory animal farms produce meat through routine torture and environmental destruction. Inevitably, intensive animal agriculture depletes valuable natural resources. Instead of being eaten by people, the vast majority of grain harvested in the U.S. is fed to farm animals. This wasteful and inefficient practice has forced agribusiness to exploit vast stretches of land. Forests, wetlands, and other natural ecosystems and wildlife habitats have been decimated and turned into crop and grazing land. Scarce fossil fuels, groundwater, and topsoil resources which took millenium to develop are now disappearing. Meanwhile, the quantity of waste produced by farm animals in the U.S. is more than 130 times greater than that produced by humans. Agricultural runoff has killed millions of fish, and is the main reason why 60% of America's rivers and streams are "impaired".