Some of Pennsylvania's natural resources include natural gas, coal and forestry resources. Pennsylvania is the country's second-largest natural gas producer, has the country's fourth-largest coal reserves and owns the largest hardwood inventory in the country, as of 2015.
Pennsylvania's natural gas resources mainly come from the Marcellus Shale, with production estimated at 4 trillion cubic feet as of 2014. The state is the only one in the country that produces anthracite coal, which contains a higher heat value compared to other kinds of coal. Coal supplies about 36 percent of the state's energy needs. With more than 60 percent of the state covered in forests, forestry is the fourth most important industry in the state. About 79 percent of commercial forests are privately owned.