https://en.m.wikipedia.org/wiki/Permian%E2%80%93Triassic_extinction_event https://en.m.wikipedia.org/wiki/Permian%E2%80%93Triassic_ext... > Though the current

https://en.m.wikipedia.org/wiki/Permian%E2%80%93Triassic_extinction_event https://en.m.wikipedia.org/wiki/Permian%E2%80%93Triassic_ext... > Though the current rate of greenhouse gas emissions is more than an order of magnitude greater than the rate measured over the course of the PTME, the discharge of greenhouse gases during the PTME is poorly constrained geo-chronologically and was most likely pulsed and constrained to a few key, short intervals, rather than continuously occurring at a constant rate for the whole extinction interval; the rate of carbon release within these intervals was likely to have been similar in timing to modern anthropogenic emissions. Modern CO2 increase has been going on for 200 years, and is theorized to be comparable to one of the bursts that occurred during the Permian-Triassic extinction. However the PTME witnessed a few such bursts over the course of tens of thousands of years. CO2 levels sextupled from a base that was not much lower than where CO2 levels are today. It's a warning about the dangers of CO2, but given the corrective actions already taking place I don't think CO2 levels will reach anywhere near those seen during the PTME. Most importantly CO2 level increases are driven by human activity which is a lot easier to modulate than volcanoes.