There is a lot of work on this under the title “background extinction rate”—see https://www.nature.com/articles/nature09678 for a review. Estimates for the current extinction rate (measured in extinctions/million species years) can be anywhere from 10-1000x faster than the background extinction rate, but it depends a lot on the technique used and the time interval measured. EDIT: typo in numbers
There is a lot of work on this under the title “background extinction rate”—see https://www.nature.com/articles/nature09678 for a review. Estimates for the current extinction rate (measured in extinctions/million species years) can be anywhere from 10-1000x faster than the background extinction rate, but it depends a lot on the technique used and the time interval measured. EDIT: typo in numbers