According to a 2006 report by the U.N. Food and Agriculture Organization, livestocks produce 18% of the world’s green house gas problems, making them one of the top 3 contributor’s to global warming. A cow can produce 25 to 130 gallons of methane a day! In addition to this, forests are replaced with grazing land and animal manure is a large source of water contamination and acid rain. Save the world and eat greens!