You can't judge a book by its cover, and you can't get the story of ocean ecology from viewing the surface. There's trouble down below, from overly warm water to vanishing kelp forests.
Enric Sala says he got tired of writing the ocean's obituary, so he turned from academia to activism. Now he runs the Pristine Seas project for National Geographic and has written several books, including the soon-to-be-published "The Nature of Nature: Why We Need the Wild."
We visit about the challenges to the ocean, and how Pristine Seas addresses them.