"The Nuclear Regulatory Commission voted 3 to 2 on Tuesday to require improvements to the emergency vents at 31 American reactors that share design similarities with the Japanese reactors that melted down two years ago. The agency stopped short, however, of requiring filters to scrub out radioactive particles coming through those vents."

"Missouri Republican Sen. Roy Blunt said on Monday that he is placing a hold on Gina McCarthy, President Obama’s pick to run the Environmental Protection Agency, which could delay a full Senate vote on the nominee."

"The number of Atlantic storms with magnitude similar to killer Hurricane Katrina, which devastated the U.S. Gulf Coast in 2005, could rise sharply this century, environmental researchers reported on Monday."

"TOKYO -- A power failure at Japan’s tsunami-damaged nuclear plant on Monday night has left three fuel storage pools without fresh cooling water for hours, the plant’s operator said."

Powerful Atlantic storms threaten long-settled areas on a Massachusetts barrier island.

"The number of people living in extreme poverty could increase by up to 3 billion by 2050 unless urgent action is taken to tackle environmental challenges, a major UN report warned on Thursday."

"NEW ORLEANS -- BP's cement contractor on the Deepwater Horizon rig has discovered cement samples possibly tied to the ill-fated drilling project that weren't turned over to the Justice Department after the 2010 oil spill, a lawyer for the contractor said Thursday."

"KALAMAZOO, Mich. -- The U.S. Environmental Protection Agency is ordering Enbridge Inc. to do additional dredging in the Kalamazoo River to clean up oil from a massive 2010 spill."

"WASHINGTON -- The Shell Oil Company must provide a detailed plan addressing numerous safety and operational issues that plagued its efforts to extract oil beneath the Arctic Ocean last year if it wants to resume drilling off the coast of Alaska, the Interior Department said Thursday."

"Within weeks of setting off a geiger counter and scrubbing three layers of skin off his hands and arms, former Navy quartermaster Maurice Enis recalled being pressured to sign away U.S. government liability for any future health problems."