Through compelling personal stories, Sylvia Earle puts the peril of the ocean and its life in perspective for a wide public audience. Less than 10 per cent of all fish species remain. Half the coral reefs globally have died or are in sharp decline. Since the 1950s, 300 dead zones - oxygen-deficient areas that can't sustain life - have appeared along coasts. Contaminated water is increasing disease worldwide, including cholera. Pollutants in seafood is sickening growing numbers of people. The human impact on oceans and subsequently on climate change is effecting the future of the planet.