"The U.S. Environmental Protection Agency said on Tuesday it would again delay issuing a final limit on smog pollution opposed by manufacturers and many Republican lawmakers until the Obama administration has finished reviewing it."

"Less than half of Pennsylvania's fossil-fueled power plants have pollution controls, a long-tolerated dirty habit that's now getting its comeuppance in tougher, new federal regulations."

"Less than half of Pennsylvania's fossil-fueled power plants have pollution controls, a long-tolerated dirty habit that's now getting its comeuppance in tougher, new federal regulations."

"Secretary of State Hillary Clinton pushed one of her simplest but potentially most transformative diplomatic priorities in India on Wednesday: clean cooking stoves."

"People living in Ohio, Pennsylvania and Florida are most at risk in the United States from toxic emissions spewing from coal and oil-fired power plants, two leading American environmental groups said in a report on Wednesday."

Congress created a cap-and-trade plan for air pollution from the nation's aging fleet of power plants 20 years ago. In its time, it was successful in cutting pollution, but today, tattered by politics and lawsuits, its future is uncertain.

"A group of Texas refineries, chemical makers and power plants have agreed to seek new air pollution permits, marking a setback for state regulators defending an air pollution program popular with business."

"In a sweeping move aimed at curbing long-distance air pollution that afflicts the health of 240 million Americans ...the Environmental Protection Agency is ordering power plants across much of the eastern United States to sharply curtail emissions."