Sylvia Earle has done something no one else has — walked solo on the bottom of the sea, under a quarter mile of water. She tells what she saw — and what she has learned — about the giant, living system that is the ocean. And, she explains why seeing a shark is a sign for hope.
Sylvia Earle is the founder of the Sylvia Earle Alliance and Mission Blue. She’s a National GeographicExplorer-in-Residence. Her books include The World is Blue: How Our Fate and the Ocean’s are One and Sea Change: A Message of the Oceans.