Earth has had more major mass extinctions than we realized

Earth has had more major mass extinctions than we realized

by Lucy Jakub, National Geographic

All these periods of sudden, drastic species loss share patterns. That has worrying implications for the climate-driven losses we’re seeing now.

Today’s biodiversity crisis is often referred to as the “sixth mass extinction” by those who believe we’re headed for a collapse in global species counts. But perhaps, some scientists argue, we should be calling it the seventh.

In 1982, quantitative paleontologists Jack Sepkoski and David Raup at the University of Chicago took stock of the Earth’s worst mass extinctions, naming them the Big Five. That set includes the end-Permian, the greatest extinction event of all time, which occurred around 252 million years ago and eliminated 95 percent of marine species.

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