HARRISBURG — Pennsylvania is home to power plants that are among the nation's leading sources of carbon dioxide, a heat-trapping gas that is heavily blamed for global warming, an environmental group said in a Tuesday report.

Philadelphia's PennEnvironment said seven power plants in Pennsylvania, all coal-fired, rank among the nation's 100 biggest emitters of carbon dioxide.

PennEnvironment's analysis was based on federal data from 2011, the most recent available. Since then, power plant owners have announced plans to close or convert at least eight of the state's about three dozen coal-fired power plants.

HARRISBURG — Attorney General Kathleen Kane has filed criminal charges against XTO Energy for a 2010 spill of natural gas drilling wastewater in Lycoming County.XTO said Tuesday it will challenge the criminal charges, which the company calls baseless, unprecedented and an abuse of prosecutorial discretion.Kane says a grand jury recommended the charges for the spill of more than 50,000 gallons of toxic wastewater.XTO is charged with five counts under the Clean Streams Law and three counts under the Solid Waste Management Act.

FARMINGTON — Pennsylvania's newest casino is laying off 15 percent of its 450 employees, citing “slower than expected” business since the resort casino opened two months ago.The Lady Luck Casino at Nemacolin Woodlands Resort opened July 1, but unlike most others in the state, it is not open to the general public. Instead, patrons must be guests of the posh resort, about 40 miles southeast of Pittsburgh; a customer of the resort's restaurants, or other facilities; or be willing to purchase a $10 resort gift card.St. Louis-based Isle of Capri Casinos, which operates the resort, said in a statement that customers have been “resistant” to the plan that limits access to the casino.

DETROIT — The government is getting closer to selling all of its General Motors Co. stock.The Treasury Department said in its August report to Congress that it sold $811 million worth of GM common stock last month.The report dated Tuesday says the government has recovered about $35.4 billion of the $49.5 billion bailout it gave the Detroit automaker. That means taxpayers are still $14.1 billion in the hole.The Treasury says the price per share of stock sold in July and August will be revealed later.