Climate Sensitivity - what is it and why is it important to know?

Andrey Ganopolski of the Potsdam Institute for Climate Impact Research (PIK) is one of the pioneers of constraining climate sensitivity from paleoclimatic data. He coauthored the recent Nature paper "Making sense of paleoclimate sensitivity", which concludes on the basis of many studies that the experience of past climate changes in Earth's history implies a warming of 2.2–4.8K per doubling of atmospheric CO2, which agrees with IPCC estimates.
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