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Fracking How dirty a word?

Hydraulic fracturing is a 50-year old practice that uses high-pressure water to break up rock layers and release trapped oil or gas. It has opened up huge new energy reserves, but some citizens and environmental groups are worried that chemicals in fracking water will contaminate aquifers. The EPA has investigated many claims but has yet to confirm one. Still, regulators are looking harder at fracking, while the natural gas industry works to better manage waste water.