John Rafferty of Encyclopaedia Britannica and Dr. Andrew Solow of the Woods Hole Oceanographic Institution discuss the concept of functional extinction. This is the sixth part of the Postcards from the 6th Mass Extinction audio series. 

Postcards from the Sixth Mass Extinction, 6th program. John Rafferty, speaker & writer; J.E. Luebering sr. editor; Kurt Heintz producer

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