"Prime Minister Stephen Harper, in an effort to win U.S. backing for the Keystone XL pipeline, has sent a letter to President Barack Obama proposing joint action to reduce greenhouse gas emissions in the oil and gas sector"

"Next time you go to toss that 'flushable' wipe in the toilet, you might want to consider a request from your sewer utility: Don’t."

"Manmade climate change played a substantial role in the exceptional warmth in the eastern U.S. during the spring of 2012, a major NOAA-led report concludes. Not only that, it greatly increased the odds of the punishing heat that baked the north central and northeast U.S. during the following summer."

"More than half a century has elapsed since the Seattle School Board — with nary a raised eyebrow, records indicate — voted to allow one of the nation's biggest and busiest highways to be built cheek-by-jowl with John Marshall Junior High, trading away the school's playground for a larger plot of land nearby."

"In the 1980s, it was South Africa. In the 1990s, it was tobacco. Now fossil fuels have become the focus of those who would change the world through the power of investing."

"The eight-state commission that sets water quality standards for the Ohio River wants a two-year delay on enforcement of a more stringent mercury standard while it considers relaxing those rules."

"The U.S. Environmental Protection Agency has fined Royal Dutch Shell affiliates $1.1 million for emitting too many pollutants into the air during the 2012 drilling season offshore in the Alaska Arctic."

"Emissions from battery recycler Exide pose a 'chronic hazard' to more than 250,000 people in surrounding areas, air district officials say. Risks include neurological changes in children."

"VIRGINIA KEY, Fla. -- The wastewater plant on this barrier island sits tucked in a northern corner, away from the wading birds, views of Miami Beach and grassy vegetation providing prime picnic spots."

"A theoretical 9.1 quake off Alaska could flood Long Beach and parts of O.C., and force 750,000 to evacuate."

"Investing in a massive coal-burning power plant in southern Illinois has saddled some towns with similarly large electricity rates."

"WASHINGTON -- A giant of coal-fired power won a $1.6 million lease to build the first wind farm off the coast of Virginia on Wednesday, a development that renewable energy advocates are cheering."

"More than 50 years into the age of nuclear energy, one of the biggest growth opportunities may be junking old reactors."

"Fearing the city's primary drinking water source could be at risk of contamination in the years ahead, Ann Arbor officials took action Tuesday night to send a message to the state."

"Prescription drugs are contaminating Lake Michigan two miles from Milwaukee’s sewage outfalls, suggesting that the lake is not diluting the compounds as most scientists expected, according to new research."