| http://www.w3.org/ns/prov#value | - This study took direct measurements of 489 shale-gas wells being drilled around the United States ??? a far more detailed look than had been done before. (The study was conducted by the University of Texas and funded by both the Environmental Defense Fund and nine oil and gas firms, including Shell and Chevron.) The study concluded that the methane leakage rates from these wells were fairly low ??
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