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At issue is a drilling practice called ' fracking ', in which water is injected into the ground at high pressure to fracture the layers of shale and release natural gas trapped in the rock.
Companies that practice fracking have not disclosed the names of chemicals they use in the past because they say they are "trade secrets."
Residents in states where fracking has been practised for years have charged that gas production has contaminated air and drinking water.
the governor has halted gas fracking until July
fracking has created a shale gas boom in the United States
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