“People were already pumping greenhouse gases into the atmosphere 5000 years before the Industrial Revolution, air bubbles in Antarctic ice suggest. The new evidence—in part from an exceptional record of atmospheric methane freshly cored from the West Antarctic Ice Sheet—supports a paleoclimatologist’s provocative idea that humanity began warming the world early, as methane bubbled out of early rice farmers’ paddies.” https://www.sciencemag.org/content/342/6161/918.full
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