@LaD_Hallo By every definition we already are well into a mass extinction event.

For some background we are currently 100x to 10,000x the background extinction rate (typically its 0.1 to 1 species per million per year, and we are currently seeing 100 to 1000 extinctions per million per year). The proper units for this is E/MSY so we are seeing 100 to 1000 E/MSY right now compared to a background of 0.1 to 1 E/MSY.

If we compare that to the rate during the big-5 mass extinctions it is as high, or significantly higher. The late devonian extinction rate (the slowest) was 70 E/MSY, meanwhile the end-permian extinction rate (the highest of the 5) was ~300 E/MSY.

Yes we are **well** within a mass extinction, and if we do not correct things immediately after 100 years at the current rate we will see the same overall extinction as these mass extinction events.