"Levels of radioactive materials have risen sharply again in seawater near the troubled Fukushima Daiichi nuclear plant in northern Japan, raising the possibility of new leaks at the complex, the government said Saturday."

"Scuffles between protesters and security guards marred BP's first annual shareholder meeting since the Gulf oil spill Thursday, as investors registered their disapproval with sizable protest votes against company directors."

"The operator of Japan’s tsunami-damaged nuclear plant said Friday it would pay an initial $12,000 for each household forced to evacuate because of leaking radiation — a handout some of the displaced slammed as too little."

"Two of the most well-known penguin species in Antarctica -- chinstraps and Adelies -- are under pressure because a warmer climate has cut deeply into their main food source, shrimp-like creatures called krill."

"The Davis Besse incident has resurfaced in the wake of the ongoing nuclear crisis at Japan's Fukushima Daiichi plant. Stories recounting close ties between Japanese nuclear regulators and utilities there have reinvigorated critics who say the NRC has not been an aggressive enough U.S. watchdog."

"Japanese officials struggled through the day on Tuesday to explain why it had taken them a month to disclose large-scale releases of radioactive material in mid-March at a crippled nuclear power plant, as the government and an electric utility disagreed on the extent of continuing problems there."

"The Goldman Environmental Foundation today announced the six recipients of the 2011 Goldman Environmental Prize - a group of grassroots leaders who are taking on tough challenges to protect the environment and their communities, often at great personal risk."

"Japan has raised its assessment of the accident at the crippled Fukushima Daiichi nuclear power plant to the worst rating on an international scale, putting the disaster on par with the 1986 Chernobyl explosion, the Japanese nuclear regulatory agency said on Tuesday."

"Three gas pipelines have exploded in an Iranain province south of the capital Tehran, a news agency reported Friday, saying the cause was unknown and giving no details of damage or casualties."

"Rich and poor nations overcame deep divisions on Friday to cut a deal that maps out U.N. climate negotiations for 2011, building on last December's agreement in Mexico and hardening the focus on tougher issues."