A 2006 UN study claimed meat production is responsible for creating more greenhouse gas emissions than the exhaust of all cars, SUVs, buses, planes and trucks combined. Methane and other greenhouse gases are produced by cow flatulence and burping.
If you need to discuss it in polite company, the process that makes cows gassy is called “enteric fermentation.” Cow burps are “ruminant eructation.”
A 2009 study estimated that half of all greenhouse gases are generated by livestock. Investigators have been collecting cow gas emissions (methane and nitrous oxide) in huge plastic containers for analysis. People concerned about Global Warming have urged a reduction in meat eating in order to reduce the size of gassy cattle herds.