15 Apr '11, 5pm

What was it like the last time CO2 levels were this high?

What was it like the last time CO2 levels were this high? Posted on 16 April 2011 by John Cook A vivid picture of our climate's future can be found in our past. Currently, atmospheric carbon dioxide (CO2) levels have reached 390 parts per million (ppm). The last time CO2 was that high was around 3 million years ago, during the Pliocene. Back then, CO2 levels remained at around 365 to 410 ppm for thousands of years. Consequently, the Pliocene gives us vital clues of the long-term effects of raised CO2 levels. New research has just been published that examines this period and confirms previous findings that the Pliocene was dramatically warmer than current temperatures. The research, published in Csank et al 2011 , uses two independent methods to measure Arctic temperature during the Pliocene, on Ellesmere Island. They find that Arctic temperatures were 11 to 16°C warmer (Cs...

Full article: http://www.skepticalscience.com/What-was-it-like-the-last...

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