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A Third of Ocean Organisms Will Be Gone.

In The World's 'Sixth Extinction,' Are Humans The Asteroid? his is FRESH AIR. I'm Dave Davies in for Terry Gross, who is off this week. We're living in an epic many scientists describe as the sixth extinction. The fifth extinction was the one that killed off the dinosaurs. Scientists now think an asteroid was responsible for that mass extinction. But this time around, human activity is responsible. Or as one scientist put it, this time, we're the asteroid. http://goo.gl/LxDQTi #FullPodcastAvailable #Podcasts

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