"A subsidiary of Nabors Industries Ltd. pumped a mixture of chemicals identified only as “EXP- F0173-11” into a half-dozen oil wells in rural Karnes County, Texas, in July. Few people outside Nabors, the largest onshore drilling contractor by revenue, know exactly what’s in that blend. This much is clear: One ingredient, an unidentified solvent, can cause damage to the kidney and liver, according to safety information about the product that Michigan state regulators have on file."

"YADKINVILLE -- Google, of all companies, last year got into the business of hog poop."

"Years of delays in addressing contamination at an old lead factory property near a Chicago elementary school appear to be coming to an end in the wake of pressure this week from community groups and a city official."

"The Environmental Protection Agency updated water quality guidelines for the nation's beaches Monday, moving in response to charges that the federal government has not done enough to protect bathers from polluted water."

"North of Gainesville, a church camp once attracted thousands of visitors because it was built around the gushing waters of Hornsby Springs. Then the spring stopped flowing and the camp had to spend more than $1 million to build a water park to replace it. The old spring site is now so stagnant that it's frequently declared unfit for humans to swim in."

"New citations against Chemical Waste Management prompt Kettleman City activists, who believe the dump has sickened children, to protest its proposal to grow."

"The Department of Energy has reduced the 586 square miles of Hanford requiring environmental cleanup to 161 square miles. In three more years, the land requiring cleanup could be little more than the 75 square miles at Hanford's center as DOE works to complete cleanup outlined in its 2015 Vision, an ambitious plan for work to be completed by the end of 2015."

"Pennsylvania's environmental protection chief is defending his agency's controversial system for testing water wells near Marcellus Shale operations by saying other states work the same way. But regulators in those states say that's not true."

"HINKLEY -- Underwater home mortgages plague the High Desert at an approximate rate of 60 percent, according to real estate website Zillow.com. But in Hinkley, residents say the entire town is dealing with mortgages above their current assessed values."

"As Northeast states take measure of the destruction brought by Hurricane Sandy, there's a new concern. New York and New Jersey have dozens of Superfund sites close to the shore. Some of these toxic zones were flooded by Sandy's storm surge. There are worries in Newark that toxic chemicals may have been swept into some people's home."

"The first time Bill Ferullo saw the white plumes drifting from a natural gas fracking site, he got out of his car to take pictures. 'I didn't know what it was,' he recalled. 'But two minutes later my chest was burning. It burned all night.'"

"The air reeks so strongly of rotten eggs that tribal leader Wes Martel hesitates to get out of the car at an oil field on the Wind River Reservation in Wyoming. He already has a headache from the fumes he smelled at another oil field."

"BP and the U.S. government portrayed in public a united front as a runaway well spewed oil into the Gulf of Mexico in 2010. But they privately sought to withhold potentially critical information from each other, possibly slowing efforts to solve the crisis, according to new testimony."

"LAKE WYLIE, N.C. -- For more than a year, one Charlotte environmental group has warned of what could happen if coal ash ponds leak into local lakes. Now, they say, it’s happening."

"Among air experts, it's an open secret: federal and state officials grossly undercount a crucial type of air pollution, often by an order of magnitude and particularly in areas like Houston with its major concentrations of petrochemical plants."