Washington: Want to avoid contributing to climate change? You may want to give up on that hamburger! Meat production contributes to climate change due to greenhouse gasses emitted by livestock, a new study has found. Researchers found that livestock emissions are on the rise and that beef cattle are responsible for far more greenhouse gas emissions than other types of animals. Carbon dioxide is the most-prevalent gas when it comes to climate change. But methane and nitrous oxide are also greenhouse gasses and account for approximately 28 percent of global warming activity. Methane and nitrous oxide are released, in part, by livestock. Animals release methane as a result of microorganisms that are involved in their digestive processes and nitrous oxide from decomposing manure. These two gasses are responsible for a quarter of these non-carbon dioxide gas emissions and 9 per cent of total greenhouse gas emissions overall. The research team, including Dario Caro, formerly of Carnegie Institution for Science and now at the University of Siena in Italy, and Carnegie's Ken Caldeira, estimated the greenhouse gas emissions related to livestock in 237 countries over a nearly half a century and found that livestock emissions increased by 51 percent over this period.