"Canadian nuclear safety regulators say they have underestimated the seriousness of a design feature at the country's electricity-producing reactors that would cause them to experience dangerous power pulses during a major accident."

"Exxon Mobil said Monday it won't appeal nearly $500 million in interest a court recently ordered it to pay to Alaska fishermen, business owners and others harmed by the 1989 Exxon Valdez oil spill."

"From 1957 to 1987, hundreds of thousands of unprepared men, women and children who lived on or near Camp Lejeune, N.C., the largest Marine Corps base on the East Coast, were the unwitting victims of a decades-long water contamination disaster that is still claiming lives."

"There’s a kind of blue and green scum that can bloom in lakes and ponds across the nation. This scum is called cyanobacteria. For years, scientists have known that this stuff can produce dangerous toxins. Amy Quinton reports now researchers are studying whether there’s a link between cyanobacteria and Lou Gehrig’s disease."

Conservative Christians -- the Republican party's "base" -- are trying to galvanize opposition to the House-passed climate bill.

The Oregon legislature Monday sent to the governor a bill that would phase out the longstanding practice of burning off agricultural fields growing grass seed.

Environmentalists say Florida officials are thwarting a 2-year-old law banning the spreading of sewage sludge on the Everglades.

"California can develop its own standards on greenhouse gas emissions from cars and trucks, though it agrees not to toughen the standards before 2017. Automakers agree to drop lawsuits."

"The Obama administration on Monday proposed to strengthen a key air pollution health standard to better protect children and people with respiratory illnesses."

Engineering projects hope to save Louisiana's shrinking coastal wetlands by diverting sediment from the Mississippi River -- but a new study says there is not enough mud in the Mississippi to do the job.