News & AnalysisClimate Change

Humans Fueled Global Warming Millennia Ago

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Science  22 Nov 2013:
Vol. 342, Issue 6161, pp. 918
DOI: 10.1126/science.342.6161.918

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People were already pumping greenhouse gases into the atmosphere 5000 years before the Industrial Revolution, air bubbles in Antarctic ice suggest. The new evidence supports a paleoclimatologist's provocative idea that humanity began warming the world early, as methane bubbled out of early rice farmers' paddies.