"Exxon Mobil was working to clean up thousands of barrels of oil in Mayflower, Arkansas, after a pipeline carrying heavy Canadian crude ruptured, a major spill likely to stoke debate over transporting Canada's oil to the United States."

"Wide-ranging investigation, which will look into six different federal departments, is to review incidents in which the media was thwarted when trying to speak to Canadian government scientists about their work."

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

"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."

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

"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."

"OTTAWA — The Harper government’s budget cuts to scientific research at Environment Canada have compromised the department’s capacity to crack down on cancer-linked pollution and its mandate to enforce clean air regulations, say enforcement officers in a collection of internal emails obtained by Postmedia News."

"YELLOWKNIFE -- Federal officials are scrambling to clean up a crumbling, abandoned northern gold mine that is in imminent danger of releasing massive amounts of arsenic, asbestos and other toxins."

The white-nose syndrome fungus that is killing bats in their caves has now spread to 22 U.S. states and 5 Canadian provinces.

"Canada's Harper Administration is allegedly restricting what environmental information government scientists can share with journalists, according to academics and media watchdogs. Host Steve Curwood learns more from Tyler Sommers, coordinator of Democracy Watch."

"Two consulting firms provided State Department with key analysis of whether the pipeline would speed development of Canada's oil sands."

"Environmentalists have a hope. If they can block the Keystone XL pipeline, they can keep Canada from developing more of its dirty tar sands oil. It takes a lot of energy to get it out of the ground and turn it into gasoline, so it has a bigger greenhouse gas footprint than conventional oil. But the State Department report, which was released Friday, says Keystone won't have much of an impact on the development of that oil from Alberta."

"Even if foes of the Keystone XL pipeline block it, companies seeking to get Canada’s oil sands to U.S. and world markets could travel the old-fashioned way: by rail."

"Event billed as largest climate protest in US history intended as show of force as Obama nears decision on controversial project."

"Autism certainly involves the brain, but researchers increasingly believe it is actually a collection of problems that affects the whole body, the accumulation of seemingly minor events that start in the womb. PAULINE TAM unravels the complexity of factors that combine to cause the disorder."