William Ruddiman is a respected climate scientist. He has come out with a claim that climate change was kicked into gear way before we started burning coal and fossil fuels. Ruddiman suggests that the farming practices of our ancestors was the starting point for global warming. The link below will bring you to the article in the Scientific American
http://www.nature.com/scientificamerican/journal/v292/n3/images/scientificamerican0305-46-I2.jpg
How Did Humans First Alter Global Climate?
Here is a short video of Ruddiman presenting his hypothesis to faculty and students at Colgate University.
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