Analyses of sediments retrieved from a drifting ice island suggest that the Arctic Ocean may have been ice free and as warm as 15 °C about 70 million years ago. Therein is a challenge for climate models.
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Poulsen, C. A balmy Arctic. Nature 432, 814–815 (2004). https://doi.org/10.1038/432814a
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DOI: https://doi.org/10.1038/432814a
