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Nature 450, 1218-1221 (20 December 2007) | doi:10.1038/nature06400;

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Environmental precursors to rapid light carbon injection at the Palaeocene/Eocene boundary

The start of the Palaeocene/Eocene thermal maximum—a period of exceptional global warming about 55|[thinsp]|million years ago—is marked by a prominent negative carbon isotope excursion that reflects a massive input of 13C-depleted (|[lsquo]|light|[rsquo]|) carbon to the ocean–atmosphere system. It is often assumed that this carbon injection initiated the rapid increase in global surface temperatures and environmental change that characterize the climate perturbation, but the exact sequence of events remains uncertain.

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