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https://www.climate-policy-watcher.org/ecological-footprints/hothouse-earth.html

According to geologists at the University of North Carolina, this period of intense warming triggered the greatest mass extinction in the Earth's history about 250 million years ago, as opposed to the theory that the mass extinction was caused when a meteor hit the Earth. Instead, they claim that volcanic eruptions and global warming were the causes of the mass extinctions during the Permian. As a result of their research, they have determined that the climate turned exceedingly hot because

Also harmful to life on the planet was the enormous amount of hydrogen sulphide that entered the atmosphere, which damaged the ozone layer and killed the majority of life-forms.

Oxygen content was drastically reduced, causing major die-offs of deep-sea foraminifera.