Denver-The natural gas boom has created a bustle of drilling activity from the exurban, rolling hills of Pennsylvania to the rural, rocky basins of Wyoming, generating opportunities for energy companies and prompting scrutiny from regulators. Driving the resurgence in natural gas is the technique of hydraulic fracturing, which involves high-pressure injection of water, sand, and chemicals to release shale gas trapped in deep underground formations that previously had been uneconomical to exploit.
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