So we don't need to worry about climate change then? http://www.pnas.org/content/105/Supplement_1/11543/F2.large.jpg http://www.pnas.org/content/105/Supplement

So we don't need to worry about climate change then? http://www.pnas.org/content/105/Supplement_1/11543/F2.large.jpg http://www.pnas.org/content/105/Supplement_1/11543/F2.large.... Cows produce methane. Here is methane breakdown of U.S. http://www3.epa.gov/climatechange/ghgemissions/gases/ch4.html http://www3.epa.gov/climatechange/ghgemissions/gases/ch4.htm... Cars produce mostly CO2, here's breakdown: http://www3.epa.gov/climatechange/ghgemissions/gases/co2.html http://www3.epa.gov/climatechange/ghgemissions/gases/co2.htm... That "Cow farts cause climate change as much as cars" stuff is PETA propaganda. I've seen as high as "52% of all carbon emissions result from meat consumption". Then I read the actual paper and "We are double counting all these numbers because of moral hazard of eating meat. Lying is OK if you do it for good cause." The 18% share was calculated by combining the direct effect of methane, then counting in some estimation of deforestation. It is true that Amazon rain forests end up as pasture, but that's not necessarily the biggest reason why they cut down the forest. They first try to grow some plants on it, but as the fertility goes down it's only good as pasture anymore. If you want to go from 18% to 8% you only need to stop increasing meat consumption. But that doesn't necessarily work if the driver of deforestation turns out to be something else.