"An oil pipeline that ruptured and spilled an estimated 383,000 litres (101,000 gallons) of crude near Santa Barbara in May had been allowed to corrode to a tiny fraction of its original thickness, federal regulators have said."

"The Obama administration is set to announce that it will require new rules to cut emissions from airplanes, expanding a quest to tackle climate change that has included a string of significant regulations on cars, trucks and power plants."

"A federal appeals court [Tuesday] rejected a series of challenges from states, environmental groups and energy companies to U.S. EPA's determinations of which parts of the country meet its standard for ozone, a main component of smog."

A recent study showed that nearly half of Delhi’s 4.4 million schoolchildren have irreversible lung damage from the poisonous air.

"ANN ARBOR, Mich. — Inside the National Vehicle and Fuel Emissions Laboratory here, a mammoth contraption, with steel rollers, advanced electronics and exhaust tubes, is nearing completion."

In a letter to pipeline safety regulators, two California Senators called "insufficient" the response of pipeline operators to a large spill near Santa Barbara.

"Environmental activists say Michigan’s tourism slogan -- “Pure Michigan” -- may no longer be accurate unless the state takes stronger action to prevent a 62-year-old oil pipeline from rupturing in a sensitive waterway."

"When Texas regulators bypassed the EPA to ease air pollution regulations on 19 coal plants, they violated the federal Clean Air Act, a new petition says".

"President Obama on Wednesday announced a sweeping new clean water regulation meant to restore the federal government’s authority to limit pollution in the nation’s rivers, lakes, streams and wetlands."

"A federal court has rejected Kansas’ challenge of the Environmental Protection Agency’s (EPA) disapproval of an air pollution plan from the state."