Arctic Reaches 100°F - RC Groups

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Just out of curiosity, how much of this do you think is caused by human activity and how much is due to solar forcing and other natural factors? According to ice samples and soil samples, scientists know the earths history and 400 or so PPM CO2 levels are historically low. In the past there were times when the CO2 levels were much higher and temps were lower. I read that one volcano eruption emits more CO2 than all of the industrial activity of the last 200 years. Feeling a bit lazy ATM.

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