How hot did Earth get in the past?

(New peer reviewed study discovers that when CO2 was higher in the past, not as hot as previously thought)

The question seems simple enough: What happens to the Earth’s temperature when atmospheric carbon dioxide levels increase? The answer is elusive. However, clues are hidden in the fossil record. A new study by researchers from Syracuse and Yale universities provides a much clearer picture of the Earth’s temperature approximately 50 million years ago when CO2 concentrations were higher than today. The results may shed light on what to expect in the future if CO2 levels keep rising.

Link to an article about a peer-reviewd study to be published in Geology magazine August 2011.   How hot did Earth get in the past?

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