Sylvia Earle at ideaCity 2010

Oceanographer Dr. Sylvia Earle has led more than 50 expeditions worldwide involving more than 6,000 hours underwater, and has also set the record for the deepest solo untethered dive - 3,000 feet into the Pacific Ocean. She has served as the chief scientist of the National Oceanic and Atmospheric Administration, and is currently an explorer-in-residence at the National Geographic Society. At ideaCity2010, Sylvia discusses life underwater and the natural systems that keep us alive.