"Hospitals are on red alert and parts of Buenos Aires have been evacuated as a toxic cloud descends upon the city."

"For years, the controversy over natural gas drilling has focused on the water and air quality problems linked to hydraulic fracturing, the process where chemicals are blasted deep underground to release tightly bound natural gas deposits."

"Frustration and inconvenience are growing in Paulsboro as a risky cleanup proceeds at a deliberately slow pace following the derailment Friday of chemical-laden train cars on a bridge over the Mantua Creek."

"The Supreme Court [Monday] weighed whether a U.S. EPA rule issued Friday could resolve a dispute over stormwater runoff from logging roads."

"The Supreme Court may use an L.A. case to decide for the first time who can be held responsible for storm water runoff pollution."

A new study suggests that BP's use of dispersants during the 2010 Gulf oil spill likely allowed oil to penetrate beaches more deeply, making harmful effects last longer.

"In the midst of the domestic energy boom, livestock on farms near oil-and-gas drilling operations nationwide have been quietly falling sick and dying. While scientists have yet to isolate cause and effect, many suspect chemicals used in drilling and hydrofracking, or fracking, operations are poisoning animals through the air, water or soil."

"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."