"TRAVERSE CITY, Mich. -- The Environmental Protection Agency issued new requirements Thursday for cleansing ballast water dumped from ships, which scientists believe has provided a pathway to U.S. waters for invasive species that damage ecosystems and cost the economy billions of dollars."

"Canada has become the first country to drop out of the UN convention to combat desertification."

"GONZALES, Tex. -- In a dusty lot off the main highway in this South Texas town, Vern Sartin pointed to a collection of hose hookups and large storage tanks used for collecting wastewater from hydraulic fracturing jobs."

"TRAVERSE CITY, Mich. — Government regulators can try to halt construction projects at power plants if they think the companies didn't properly calculate whether the changes would increase air pollution, a federal appeals court ruled Thursday, marking the latest twist in a decades-long fight over the Clean Air Act."

"The Environmental Protection Agency will move ahead Friday with a rule requiring cleaner gasoline and lower-pollution vehicles nationwide, amounting to one of President Obama’s most significant air pollution initiatives, according to people briefed on the decision."

"The residents of south Seattle's 98108 ZIP code, some living cheek-by-jowl with the Duwamish River Superfund site, face a high degree of environmental health threats and are likely to live sicker and die younger than residents of other Seattle neighborhoods, says a new report by two nonprofit groups."

"AKWESASNE — A $20 million settlement may remedy nearly 60 years of environmental pollution to the St. Regis Mohawk Reservation."

"Spending about 100 hours each month in the air, flight attendants are bombarded with pesticides, radiation, ozone and any illnesses passengers carry on board. Now new research shows that they also fly along with some of the highest levels ever measured for some flame retardants."

"HOUSTON -- Oklahoma's largest-recorded earthquake was triggered by injection wells used by the oil and gas industry, according to a report released this week."

"Snow-surveying crews across the Sierra are seeing bad news up close this week. California has about half a snowpack."