Polar warming might be greater than accounted for in climate models
Climate models may have to be revisited

The Eocene, a period of global warming and high atmospheric CO2 concentrations some 50 million years ago, is a reference period to assess the possible effects of global warming as a consequence of industrial activity. An international isotope study on marine fossils that were formed during the Eocene suggests that polar waters warmed up much more than what scientists believed until now and what has been used in models to predict climate changes. Models might have to adjusted to compensate for the apparent underestimation of polar sea warming.

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Scientific publication: http://www.pnas.org/