Are we in the middle of a 6th Mass Extinction?

At the very end of the semester, we are talking about extinctions and mass extinctions.  This video from Business Insider and Dr. Lisa Randall talks briefly about the potential for a human-caused 6th mass extinction.

http://www.businessinsider.com/earth-sixth-mass-extinction-dinosaur-meteor-volcano-lisa-randall-2015-11#ooid=5jdWFteDrJ5J0ZQaZr9tUiHsMSmERa-O

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