"A mile-long train hauling oil from Canada derailed and leaked 30,000 gallons of crude in western Minnesota on Wednesday, as debate rages over the environmental risks of transporting tar sands across the border."

"KANSAS CITY, Mo. -- The federal government has agreed to pay 90 percent of the cost of developing a plan to clean up toxic groundwater pollution at a former U.S. Air Force base in central Kansas, according to court documents filed Tuesday."

"DES MOINES, Iowa -- A federal appeals court has sided with a group of Iowa cities challenging Environmental Protection Agency wastewater treatment rules that would have forced cities across the country to spend billions of dollars if the court had upheld them."

"Fifty-five percent of U.S. river and stream lengths were in poor condition for aquatic life, largely under threat from runoff contaminated by fertilizers, the U.S. Environmental Protection Agency said on Tuesday."

"BILLINGS, Mont. -- Federal regulators proposed $1.7 million in civil penalties against Exxon Mobil Corp. on Monday for safety violations linked to a pipeline rupture that spilled an estimated 63,000 gallons of crude oil into Montana's scenic Yellowstone River."

"When a Texas landowner took his fear that a gas driller had poisoned his well to federal regulators, the company, Range Resources Corp., turned around and sued him for conspiring 'to harm Range.'"

"WILLARD, Utah -- A Chevron fuel spill near a northern Utah bird refuge is much worse than originally thought as up to 27,000 gallons might have leaked, authorities said."

"Teck Coal Ltd. is facing a massive pollution problem in the Elk Valley, where a metal-like element known as selenium is leaching out of mine sites and collecting in the eggs of fish, frogs and water birds."

"WASHINGTON — A coalition of energy companies, environmentalists and Pennsylvania-based philanthropies announced Wednesday the creation of a center that would provide more stringent standards for fracking and natural gas development in the Eastern United States."