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In page Shale gas:

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Drilling depths of 1,000 to 3,000 m, then injection of a fluid composed of water, sand and detergents under pressure (600 bar), are required to fracture the rock and release the gas. These operations have already caused groundwater contaminations across the Atlantic, mainly as a result of hydrocarbon leakage along the casings.[citation needed] In addition, between 2% and 8% of the extracted fuel would be released to the atmosphere at wells (still in the United States).[citation needed] However, it is mainly composed of methane (CH4), a greenhouse gas that is considerably more powerful than CO2.