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Horizontal drilling and hydraulic fracturing have changed the nation’s energy supplies so dramatically that now people are pushing to export domestic oil and natural gas internationally, Gale Norton, a former U.S. Secretary of the Interior, said at an oil and gas conference Wednesday.
That's a big change from a decade ago when many worried that the American oil and gas industry would dry up completely.
Norton opened up the two-day “Clean Frac’ing 3” conference at Colorado’s Beaver Creek…