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In page Fracking:

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The potential environmental effects of hydraulic fracturing include air emissions and climate change, high water consumption, groundwater contamination, land use,[1] risk of earthquakes, noise pollution, and various health effects on humans.[2] Air emissions are primarily methane that escapes from wells, along with industrial emissions from equipment used in the extraction process.[3] Modern UK and EU regulation requires zero emissions of methane, a potent greenhouse gas.[citation needed] Escape of methane is a bigger problem in older wells than in ones built under more recent EU legislation.[3]