That’s A Lot Of Dung

Humans have been changing the global climate since thousands of years before the industrial revolution … Beginning 8,000 years ago, atmospheric levels of carbon dioxide began to rise as humans started clearing forests, planting crops and raising livestock … Methane levels started increasing 3,000 years later [this] staved off what should have been a period of significant natural cooling … The changes also disrupted regular patterns that dominated the 400,000 years of atmospheric history … “You have 395,000 years of history, which sets some rules, and 5,000 years that break those rules”.