Nature Research, Nature Geoscience, 3(2), p. 156-159, 2009
DOI: 10.1038/ngeo454
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The warm period known as the Palaeocene–Eocene Thermal Maximum (PETM) was a period of climatic turmoil that lasted more than 100,000 years. Ocean temperatures increased by 3–10 |[deg]|C, and atmospheric concentrations of methane and carbon dioxide rose sharply.