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Up to 16% of hydraulically fractured oil and gas wells spill liquids every year, according to new research. Scientists found that there had been 6,600 releases from these fracked wells over a ten-year period in four states. The biggest problems were reported in oil-rich North Dakota where 67% of the spills were recorded. The largest spill recorded involved 100,000 litres of fluid with most related to storing and moving liquids. [Source: BBC News]
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