In short, there was no major extinction (nothing like what happened during the end-Permian), some slow adopting benthic (deep ocean species) went extinct, howev

In short, there was no major extinction (nothing like what happened during the end-Permian), some slow adopting benthic (deep ocean species) went extinct, however. The reason there was no major extinction was mostly due to the fact that the warming happened over a span of thousands of years. What we are doing to earth today is happening at a rate at least an order of magnitude faster than during the PETM (see the nature geoscience article I linked below), likely even faster. That wikipedia page has a good summary but here is Jerry's detailed scientific paper on this topic: https://www.diva-portal.org/smash/get/diva2:469826/FULLTEXT01.pdf https://www.diva-portal.org/smash/get/diva2:469826/FULLTEXT0... This is my PhD adviser's paper. It is best to date estimate on the rate of carbon emissions during the PETM: https://www.soest.hawaii.edu/oceanography/faculty/zeebe_files/Publications/ZeebeEtAl-NGS16.pdf https://www.soest.hawaii.edu/oceanography/faculty/zeebe_file...