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The first experimental use of hydraulic fracturing was in 1947, and more than 1 million U.S. oil wells have been fracked since, according to the American Petroleum Institute. The National Petroleum Council estimates that up to 80 percent of natural oil wells drilled in the next decade will require hydraulic fracturing. (Associated Press)
Photo by: Brennan Linsley
The first experimental use of hydraulic fracturing was in 1947, and more than 1 million U.S. oil wells have been fracked since, according to the American Petroleum Institute. The National Petroleum Council estimates that up to 80 percent of natural oil wells drilled in the next decade will require hydraulic fracturing. (Associated Press)

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