Methane emissions are a real problem. As a greenhouse gas, methane has at least 25 times the heat-trapping power of carbon dioxide. More than a third of all the methane that humans are responsible for putting into the atmosphere comes from domestic livestock: cattle, sheep, goats and buffalo. In California alone, dairy cows along with a smaller number of beef cattle emit the heat trapping equivalent of the emissions from 2.5 million cars.
