This finding is based on a mathematical analysis of the five mass extinction events occurring within the past 540 million years. What do all of these mass extinction events have in common? How We Understand Past Mass Extinction EventsHowever, before we jump into his findings, let's discuss how we understand past mass extinction events. However, four of the five mass extinction events fell above the threshold. The basis of how long extinction events take to fully realize is based on past extinction events.

Source: Forbes September 21, 2017 17:33 UTC