Reuters: An Exxon Mobil Corp subsidiary is being charged by the Pennsylvania attorney general for spilling more than 50,000 gallons of wastewater at a natural gas well site in 2010. XTO Energy Inc, which was acquired by Exxon in 2010, is charged for spilling chemical-laced wastewater from a storage tank and into a local waterway, according to a statement from the Attorney General Kathleen Kane on Tuesday. State environmental inspectors found the water leaking from an open valve on a tank at an XTO water...