A transient thermal maximum occurred near the Paleocene-Eocene boundary about 56 million years ago and was associated with a rapid increase in atmospheric carbon dioxide concentrations, possibly caused by massive outgassing and oxidation of methane hydrates from the ocean floor.
Sources
- Climate change - Abrupt Changes, Earth History, Impacts (britannica.com)
- https://www.pnas.org/doi/10.1073/pnas.1603348113 (pnas.org)
- https://www.realclimate.org/index.php/archives/2009/08/petm-weirdness/ (realclimate.org)
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