Prehistoric farmers cleared of carbon crimes

 作者:扈眯     |      日期:2019-03-08 02:11:01
OUR ancient ancestors are off the hook about contributing to climate change. About 6000 years ago, levels of atmospheric carbon dioxide rose – and until now slash-and-burn by the 12 million humans on the planet at the time has been blamed. Now these early farmers have been absolved. The 20-parts-per-million rise in CO2 concentration which occurred between 7000 and 500 years ago wasn’t their fault, say Joachim Elsig at the University of Bern in Switzerland and his colleagues (Nature, DOI: