"In a letter submitted Friday afternoon to internal investigators at the Nuclear Regulatory Commission, a whistleblower engineer within the agency accused regulators of deliberately covering up information relating to the vulnerability of U.S. nuclear power facilities that sit downstream from large dams and reservoirs."

"The letter also accuses the agency of failing to act to correct these vulnerabilities despite being aware of the risks for years.

"More than 191,000 gallons of toxic chemicals may have been released from the Stolthaven New Orleans petroleum and chemical storage and transfer terminal in Braithwaite during Hurricane Isaac, according to a company report filed Tuesday with the U.S. Coast Guard National Response Center. That's just one day after the Louisiana Department of Environmental Qualty assured the public that monitoring at the facility detected no offsite contamination."

Land contamination may be as important as the direct radiation dose to humans in setting safety standards for nuclear plants, the disaster at Japan's Fukushima site suggests.

"AUBURN, Ala. -- Scientific testing has confirmed a link between oil from the massive BP spill and tar found on Alabama beaches after Hurricane Isaac."

"Nearly two years before peace activists broke into a U.S. nuclear weapons facility in late July, government investigators warned in classified reports of lax security at the complex where the nation's largest concentration of weapons-grade uranium is stored."

"CHICAGO -- For two decades, one of the most commonly used type of rail tanker has been allowed to haul hazardous liquids from coast to coast even though transportation officials were aware of a dangerous design flaw that almost guarantees the car will tear open in an accident, potentially spilling cargo that could catch fire, explode or contaminate the environment."

Eleven years after the 9/11 terrorism attack, Department of Homeland Security officials explained to a House Energy subcommittee why their program to harden security at U.S. chemical plants still hasn't been implemented.

"The GAO says the Department of Homeland Security has not established the need or effectiveness of a multibillion-dollar upgrade to the BioWatch system."

"Wildfires burning across the northern Rockies threatened hundreds of homes on Monday in Idaho, Wyoming and Montana, while firefighters in Washington state scrambled to battle scores of blazes sparked by weekend lightning storms across the eastern Cascades."

"For years they were alone as their strength was sapped and their bank accounts drained by the cancers they caught at Ground Zero. Now, finally, New York’s 9/11 heroes have gotten some backup."