Pre-Industrial Farming Sprouted Global Warming | LiveScience: "Early farmers boosted Earth's temperature by 1.6 degrees Fahrenheit (0.9 degrees Celsius) over a period of 8,000 years, a new study suggests.
"This is almost as large as the global warming in the past 150 years," said Feng He, lead study author and a climate scientist at the University of Wisconsin, Madison. "That means early agricultural is as powerful as the whole Industrial Revolution."
However, the study concludes that the net warming caused by early humans was only 1.3 degrees F (0.73 degrees C), thanks to a slight cooling of 0.31 degrees F (0.17 degrees C) due to more sunlight reflecting from cleared land."
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