Thanks to fracking in the Marcellus shale, Pennsylvania has led a U.S. natural gas revolution since 2007. The state’s production has exploded almost 40-fold, to over 7,300 billion cubic feet, or 20% of the national total. Pennsylvania now ranks second only to Texas on this measure and yields…

Thanks to fracking in the Marcellus shale, Pennsylvania has led a U.S. natural gas revolution since 2007. The state’s production has exploded almost 40-fold, to over 7,300 billion cubic feet, or 20% of the national total. Pennsylvania now ranks second only to Texas on this measure and yields…