"DENVER -- Colorado regulators looking at new air quality rules for oil and gas drillers are getting more time to set the rules."

"ANGELICA, N.Y. — Questions about the integrity of official water tests are stirring the latest controversy over New York State’s embattled policy of allowing imports of radioactive waste from natural gas drilling operations in Pennsylvania."

"For auto companies, that Environmental Protection Agency-approved MPG sticker on a new car is a high stakes and expensive process. These days it can be damaging to a company's image if customers can't achieve that great fuel economy in their own commutes."

"Jimmy Carter put up solar panels in 1979, then Ronald Reagan took them down in 1986. Now the Obama administration is fulfilling a long-delayed promise to put solar panels back on the White House."

"MIDLAND, Mich. -- As Dow Chemical’s chief executive, Andrew N. Liveris has made himself into something of an outcast among his fellow business leaders. The reason? He is spearheading a public campaign against increased exports of natural gas, which he sees as a threat to a manufacturing renaissance in the United States, not to mention his own company’s bottom line."

"Pending greenhouse gas regulations cloud the future of coal-burning power plants. But electric utilities are investing to keep large facilities going."

"A little-known company called Halek Operating ND LLC is facing the largest fine North Dakota has ever levied against an oil and gas producer -- $1.5 million -- for jeopardizing drinking water near Dickinson."

"WASHINGTON -- About 200 environmental activists gathered in front of the State Department Monday morning to protest the proposed expansion of the Keystone XL pipeline through the midwestern United States."

"MONTREAL -- Tests conducted by an environmental group suggest last month’s Lac-Mégantic, Quebec, train disaster had a devastating impact on water quality and soil in the affected area."