In The World's 'Sixth Extinction' Are Humans The Asteroid?

The dinosaurs were killed during the Fifth Extinction ? which scientists suspect was caused by an asteroid. Now, we are living through an epoch that many scientists describe as the Sixth Extinction and this time, human activity is the culprit.

Source: http://www.npr.org/2014/02/12/275885377/in-the-worlds-sixth-extinction-are-humans-the-asteroid?ft=1&f=1007

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