Mainly known as the pollution linked to cattle breeding (and thus to the meat we eat), methane represents the second source of global warming. Photo: AFP Taking action now to scale back our methane emissions could not only be a game-changer in the fight against global warming, but is also something completely within our reach, says a new United Nations study. According to the report, this strategy could allow us to reduce global temperatures by 0.3°C by 2045. When it comes to global warming, carbon dioxide (CO2) emissions are often in the headlines. But methane (CH4), another greenhouse gas, also contributes to global warming.