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In page Paleocene–Eocene thermal maximum:
"Since at least 1997, the PETM has been investigated in geoscience as an analogue to understand the effects of global warming and of massive carbon inputs to the ocean and atmosphere,[1][2][3] including ocean acidification.[4] A main difference is that during the PETM, the planet was ice-free, as the Drake Passage had not yet opened and the Central American Seaway had not yet closed.[5] Although the PETM is now commonly held to be a "case study" for global warming and massive carbon emission,[6][7][8] the cause, details, and overall significance of the event remain uncertain.[citation needed]
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