Cumulative environmental and employment impacts of the shale gas boom

Natural gas has become the largest fuel source for electricity generation in the United States and accounts for a third of energy production and consumption. However, the environmental and socioeconomic impacts across the supply chain and over the boom-and-bust cycle have not been comprehensively characterized. To provide insight for long-term decision-making for energy transitions, we estimate the cumulative effects of the shale gas boom in the Appalachian basin from 2004 to 2016 on air quality, climate change and employment. We find that air quality effects (1,200 to 4,600 deaths; US$23 billion +99%/-164%) and employment effects (469,000 job-years +/- 30%; US$21 billion +/- 30%) follow the boom-and-bust cycle, while climate impacts (US$12 billion to 94 billion) persist for generations well beyond the period of natural gas activity. Employment effects concentrate in rural areas where production occurs. However, almost half of cumulative premature mortality due to air pollution is downwind of these areas, occurring in urban regions of the northeast. The cumulative effects of methane and carbon dioxide emissions on global mean temperature over a 30-yr time horizon are nearly equivalent but over the long term, the cumulative climate impact is largely due to carbon dioxide. We estimate that a tax on production of US$2 per thousand cubic feet (+172%/-76%) would compensate for cumulative climate and air quality externalities across the supply chain.