The Marcellus Shale has provided an economic boom to Pennsylvania, with the potential to create 111,000 jobs and contribute $987 million in revenue to Pennsylvania by 2011. Bradford County, for example, leads the state in job creation, adding 2,500 new jobs. But some see this as a threat to the environments, and others merely want to use natural gas drilling to fill state tax coffers.
Know the Drill: Environmental Impact is the fourth in a series about the impact of Pennsylvania's natural gas boom, looking at the environmental impact of gas drilling and fracking.