Oceanographer Sylvia Earle's Campaign to Save the Oceans

Legendary oceanographer Sylvia Earle has spent a lifetime at the bottom of the sea, and at 86 she is still campaigning to save the oceans. Her new book, “National Geographic Ocean: A Global Odyssey,” explains why clean oceans are vital to humanity. She joins the show from California to explain why oceans matter and what keeps drawing her back to the water.