Fabien Cousteau, the grandson of legendary French oceanographer Jacques Cousteau, emerged from the deep Wednesday after 31 days in an undersea lab off the Florida Keys.
By absorbing carbon emissions from the atmosphere, the seas avert climate damage worth up to $222 billion (163 billion euros) every year, according to an estimate released.
Fish are losing their survival instinct -- even becoming attracted to the smell of their predators -- as the world's oceans become more acidic because of climate change, new research.
US Secretary of State John Kerry warned royalty, corporate kings and environmental warriors that governments won't save the seas without "significant impetus" from every sphere of society.
Three icebreaking ships were Thursday hurrying to reach a Russian vessel carrying 74 people on a scientific expedition which is trapped by ice off Antarctica, with Australian authorities coordinating the rescue mission.
Oceans that grow more acidic through Man's fossil fuel burning emissions, can amplify global warming by releasing less of a gas that helps shield Earth from radiation.
An exhausted British-Australian expedition recreating Ernest Shackleton's 1916 crossing of the Southern Ocean in a small boat made landfall Monday after a perilous 12-day journey.
Australia Friday created the world's largest network of marine reserves, protecting a huge swathe of ocean environment despite claims it will devastate the fishing industry.
Quadruple amputee Philippe Croizon swam between islands in the icy Bering Strait Friday to cross from America to Asia in the final part of a quest to link all continents.