According to paleoclimatologist William Ruddiman, when did civilization begin to release significant amounts of carbon dioxide and methane into the atmosphere?

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According to William Ruddiman, civilization began to release significant amounts of carbon dioxide and methane into the atmosphere about 8000 years ago due to the widespread agricultural practices and deforestation. This is known as the "early anthropogenic hypothesis."

According to Paleoclimatologist William Ruddiman, When Did Civilization Begin to Release