Humans May Be Causing the Sixth Great Extinction in Half a Billion Years

In the past half billion years, five great extinctions have transformed life on Earth, whether brought about by a catastrophic meteor impact that killed off the dinosaurs or prolonged periods of intense volcanic activity, which wiped out as much as 97 percent of all species. Now, say scientists, Earth may be experiencing a sixth wave of mass extinction. But this time, humans are the cause.

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