Was going through the mass extinction events that earth went through.
Frequency : there's a mass extinction event every 25 million years. So how far are we from the next one? Rather far. There hasn't been any in last 66 million years. Implying we missed the one in between at around 25m years back. And also has possibly evaded the one we ought to face with in 2m years back. That's two misses on a row.
But not all mass extinctions are equal. Some are far larger than the others.
Earth formed land some 5000m years back. But was't really livable. Had been livable after half it's current lifespan. 2500m years ago when it got oxygen.
Since then it passed through 5 major extinction events. The second one was due to too much plants on the land. That was some 400m years ago, and that was when earth first got trees. There weren't trees before that.
https://phys.org/news/2019-04-earth-major-mass-extinctions.html