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December 25, 2012

Watts Up With That?

Guest post by Michael Pacnik

Especially in the context of recent discussion of the Shakun et al. paper, a look at other sources for temperature history versus CO2 can be helpful, examining timescales ranging from the past century to the past 11000 years and even the past 500 million years.

Recent discussion of the Shakun et al.  (Nature 2012) paper has illuminated issues in its presentation of the history of CO2 versus temperature (commentaries here, here, here, and here).

In addition to those investigations, another helpful approach may be to take a step back and cross-check with other sources.  In general, does CO2 correlate with temperature in climate history?

The answer is  often yes on “medium” timescales, but no on “short” timescales and also no on the very longest timescales of all. If one looks at all three timescales, overall observations are consistent with temperature rise…

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