Over the past decade, advances in technology have allowed the oil and gas industry to extract tightly-bound natural gas from shale formations deep underground. The resulting drilling boom has transformed communities around the country, boosting local economies but also raising concerns about how the intense industrial activity is affecting air pollution, water quality and public health.
In late June, InsideClimate News reporter Lisa Song had the rare opportunity to tour several drilling and processing facilities and get an insider's look at how exactly the gas is extracted and turned into fuel.
All photos by Lisa Song unless otherwise noted.
Image: U.S. natural gas production by source, 2012-2040, in trillions of cubic feet. Shale gas is shown in green. Source: U.S. Energy Information Administration (EIA), Annual Energy Outlook, May 7, 2014.