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my research has concentrated on the climatic role farmers played during the last several thousand years by clearing land, raising livestock, and irrigating rice paddies, all of which put increasing amounts of greenhouse gases in the atmosphere. This led to the ‘early anthropogenic hypothesis’ that early agriculture caused the observed (and anomalous) reversals in the natural declines of atmospheric CO2 (carbon dioxide) near 7000 years ago and CH4 (methane) near 5000 years ago. This hypothesis provoked a major debate, with some 50 papers published for or against it in the last decade, but with a favorable shift in the last few years based on emerging archeological evidence. My research on this issue has been NSF-funded for 7 years (and the next two), despite its controversial nature.
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