![]() Now we're witnessing what a lot of people are calling the sixth mass extinction where the same thing could happen on our watch. And by mass extinctions, I mean at least 75%, three quarters of the known species disappearing from the face of the Earth. Tony Barnosky: There are five times in Earth's history where we had mass extinctions. And the last was the dinosaurs, 66 million years ago. These peaks represent the few times that life collapsed globally. I don't think you'll find a scientist that will say we're not in an extinction crisis.īarnosky's research suggests today's rate of extinction is up to 100 times faster than is typical in the nearly 4 billion year history of life. ![]() ![]() We know the rate of extinction is 'extraordinarily high' because of a study of the fossil record by biologist Tony Barnosky, Ehrlich's Stanford colleague.
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