"In pens off Baja, an Icelandic company is raising the fish, a delicacy whose numbers have plummeted in recent years. It hopes to please consumers and environmentalists too."

"The persistent inability of the United Nations to forge international consensus on climate change issues was on display Wednesday, as Security Council members disagreed over whether they should address possible instability provoked by problems like rising sea levels or competition over water resources."

"Famine in parts of southern Somalia has killed tens of thousands of people, mostly children, the United Nations said Wednesday in an official declaration of what aid officials describe as the worst humanitarian crisis in the troubled country in two decades."

"Polar bear cubs forced to swim long distances with their mothers as their icy Arctic habitat melts appear to have a higher mortality rate than cubs that didn't have to swim as far, a new study reports."

"Politicians might not believe in climate change, but insurance companies do. They track disasters, and it turns out that disasters just in the first six months of this year already cost the world more than any other year of disasters on record."

"New cargo and transport vessels must meet energy efficiency standards and cut carbon pollution, the U.N. agency regulating international shipping decided Friday. The decision came despite opposition from China, India and Brazil."

"Japan's second-biggest retailer said on Sunday it had sold beef from cattle that ate nuclear-contaminated feed, the latest in a series of health scares from radiation leaking from a quake-crippled nuclear power plant."

"Five million people are at risk of cholera in drought-hit Ethiopia, where acute watery diarrhea has broken out in crowded, unsanitary conditions, the World Health Organization (WHO) said on Friday."

"Climate scientists have turned to the United States and Australian navies to deploy robotic measuring devices in the Indian Ocean where pirates have made the area too dangerous for researchers."

As stocks of many fish species in the oceans are reduced or depleted by overfishing, aquaculture is increasing rapidly worldwide as a way of filling the gap. But that growth has been accompanies by serious environmental costs.