mass extinction
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Climate change
Is the World on the Brink of a Mass Extinction Event?
It’s not unusual for species to go extinct; it happens all the time. In fact, scientists estimate that at least 99.9% of all species of plants and animals that have ever lived on Earth are now extinct. That’s pretty amazing, considering how many species still exist—up to 8.7 million, according to some experts. Mass extinction […]