We are currently experiencing sixth Mass Extinction event. It started at least 20k years ago, and is generally linked to the end of glaciacion of the northern h

We are currently experiencing sixth Mass Extinction event. It started at least 20k years ago, and is generally linked to the end of glaciacion of the northern hemisphere and human activity. It is not exactly known if this rate is fast or slow, because from our perspective we can't really estimate the length of previous mass extinction events. After all, the closest one was 66M years ago, and with fossil evidence gradual decrease of biodiversity over the course of 1M years wouldn't look much different if said decrease would take just 1 year.