The Four Horsemen Of The Sixth Mass Extinction, Jeremy Hance

The Four Horsemen Of The Sixth Mass Extinction, Jeremy Hance

Periodically, in the vast spans of time that have proceeded us, our planet’s living beings have been purged by planetary catastrophes so extreme they make your typical Ice Age look like the geological equivalent of a stroll in the park. Scientists count just five mass extinctions in an unimaginably long expanse of 450 million years, but they warn we may well be entering a sixth.