There have been five particularly large extinction events in Earth’s history, and for the first time all of them have been linked to global warming
Source:
https://www.newscientist.com/article/2244353-all-five-of-earths-largest-mass-extinctions-linked-to-global-warming/?utm_campaign=RSS%7CNSNS&utm_source=NSNS&utm_medium=RSS&utm_content=home