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In this June 9, 2014 file photo, drivers and their tanker trucks, capable of hauling water and hydraulic fracturing liquid, line up near a natural gas burn off flame and storage tanks in Williston, N.D. According to a 2005-12 study at Geisinger Clinic in Pennsylvania, fracking may worsen asthma in children and adults who live near natural gas drilling sites. People with asthma are vulnerable to air pollution, and diesel exhaust from heavy truck traffic involved in the process may be one of the culprits, although the study doesn't prove what caused patients' symptoms. (Photo by Charles Rex Arbogast/AP Photo)
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