As the human population continues to multiply -- and our biological footprint on the planet becomes larger -- so do all the things associated with us, including our livestock, says the New York Times. For example, according to a new report by the Food and Agriculture Organization of the United Nations: At present, there are about 1.5 billion cattle and domestic buffalo and about 1.7 billion sheep and goats in the world. Global livestock grazing and feed production use 30 percent of the land surface of the planet. Livestock -- which consume more food than they yield -- also compete...