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A new study says new unconventional wells leak far more than older and traditional wells in Pennsylvania’s fracking boom. The study was published Monday by the Proceedings of the National Academy of Sciences. The research was paid for in part by an environmental activist group and criticized by the energy industry. A team of four scientists analyzed more than 75,000 state inspections of gas wells done in Pennsylvania since 2000. The study found that traditional wells drilled after 2009 had a leak rate of about 2 percent; the rate for wells drilled horizontally was about 6 percent.

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