At COP26 this month, 105 countries including the US, Canada and Brazil promised to reduce their methane gas emissions by at least 30% within eight years. Methane traps eighty-four times more heat than carbon dioxide. The IPCC says that whilst being a short lived gas (12 years) and existing in small atmospheric quantities of only 2 parts per million, a cut in methane emissions has the greatest potential to slow climate warming over the next two decades. Agriculture contributes to 40-45% of these global methane emissions, largely arising from cattle and dairy farming.