Assertion: gas's volume | /r/HasProperty | required in europe
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Source sentences:
text: According to the Oxford Institute for Energy Studies, greater volumes of fracturing fluids are required in Europe, where the shale depths average 1.5 times greater than in the U.S. Surface water may be contaminated through spillage and improperly built and maintained waste pits, and ground water can be contaminated if the fluid is able to escape the formation being fractured (through, for example, abandoned wells, fractures, and faults) or by produced water (the returning fluids, which also contain dissolved constituents such as minerals and brine waters).