6 things to know about Earth's 6th mass extinction | MNN - Mother Nature Network - 0 views
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Natural disasters have triggered at least five mass extinctions in the past 500 million years, each of which wiped out between 50 and 90 percent of all species on the planet
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it's happening again. A 2015 study reported the long-suspected sixth mass extinction of Earth's wildlife is "already underway." And a 2017 study calls the loss of that wildlife a “biological annihilation” and a “frightening assault on the foundations of human civilization.
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And while previous extinctions were often linked to asteroids or volcanoes, this one is an inside job. It's caused mainly by one species — a mammal,
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