The warming of the Earth's climate more than 50 million years ago is as yet unexplained. Now the finger points to the heating of sediment in the Gulf of Alaska as an important source of the greenhouse gas methane.
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Clift, P., Bice, K. Baked Alaska. Nature 419, 129–130 (2002). https://doi.org/10.1038/419129a
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DOI: https://doi.org/10.1038/419129a
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