Over the past half billion years, there have been at least twenty mass extinctions.
NEWYORKER: The Sixth Extinction?
Mass extinctions, says Anthony Barnosky, are geological events in which at least 75% of animal species were wiped out.
BBC: Leaving our mark: What will be left of our cities?
The book explains how Earth will change for every degree rise in temperature - from droughts to mass extinctions.
BBC: Climate book is judges' hot pick
In the fossil record, mass extinctions stand out.
The researchers suggest the evolution of large body sizes among dinosaurs was the result of long exposures to stable environments, and was reset by the mass extinctions that occurred at the end of these periods.
MSN: Dinosaurs were just born to be giants, research shows
We experienced two mass ocean extinctions 55 and 251 million years ago.
FORBES: A Call to Arms on Climate Change
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