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Scientists at the Oceans Alive project of the group Environmental Defense have updated their popular guide to the best and worst seafood choices. For the first time, the list indicates which fish are both high in omega-3 fatty acids -- the "good" fats -- and low in mercury contamination.

Join an NPR/National Geographic Radio Expedition for a journey to Patagonia in Argentina. Visit with hundreds of thousands of Magellanic penguins and the researchers who study them.

A growing number of countries are calling to halt mining on the ocean floor. The topic will take center stage at thi annual assembly of the International Seabed Authority, which governs seabed mining.

Marine scientists say record ocean temperatures have sparked widespread coral bleaching in the Florida Keys. The extreme heat and bleaching have been deadly — killing all coral on one popular reef.

After being hunted for decades, humpback whales returned to the Pacific Ocean in big numbers. Now, new technology is revealing that underwater heat waves are taking a toll on that recovery.

The Arctic is heating up twice as fast as the rest of the Earth, and sea ice is rapidly disappearing during the summer months. Some studies now suggest the Arctic Ocean could be free of ice in the summertime by the year 2030, with major repercussions in the region and beyond.

The SS United States, the fastest ocean liner to ever cross the Atlantic, is preparing for one final voyage. Then it'll be sunk and turned into the world's largest artificial reef.

The seafood industry has some well-publicized problems: from overfishing to contaminants that make their way into fish. Now, a handful of startups aim to offer a "clean" alternative grown from cells.

Climate change is heating oceans faster than the world's coral reefs can handle. So scientists are breeding corals that can withstand hotter temperatures – but only to a point.

The anti-apartheid activist, who died Tuesday, worked to end apartheid alongside Nelson Mandela. In his later years, he lamented South Africa's divisions and criticized President Jacob Zuma.