Global warming 55 million years ago was accompanied by a massive injection of carbon into the ocean-atmosphere system, but the resulting climatic warming was much greater than expected from the modelled rise in atmospheric carbon dioxide alone.
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Beerling, D. Enigmatic Earth. Nature Geosci 2, 537–538 (2009). https://doi.org/10.1038/ngeo582
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DOI: https://doi.org/10.1038/ngeo582
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