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The industry says the method is safe, but critics say it could cause earthquakes and pollute water sources.
BBC: US to become 'world's biggest oil producer'
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Opponents fear UK Methane will use hydraulic fracking to extract gas which they say could pollute water supplies.
BBC: Meeting over Keynsham gas extraction plan by UK Methane
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They say the mine will pollute water and force people off their land.
BBC: Rival marches in Ecuador over Amazon mining plans
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Critics say it can pollute water and cause minor earthquakes.
BBC: Drilling for gas
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But environmental groups and some doctors say regulations still aren't stringent enough and the practice can pollute ground water.
NPR: AP: NY Fracking Held As Cuomo, RFK Jr. Talk Health
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This prop house rental had been gutted of its engine and transmission, to avoid having the fluids pollute the water.
FORBES: Cashing In On Tom Cruise's 'Risky Business' Porsche 928
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In part, it's still the hangover from last summer's storms, but it's also caused by the process of changing over to gasoline that is less polluting in the warm weather, and that procedure is more disruptive this year because distributors are switching from the old chemical called NTBE, which has been found to pollute ground water, to ethanol.
NPR: Marketplace Report: Feeling the Pain at the Pump
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Damon and Frances McDormand play Steve and Sue, two advance agents for a large natural-gas company, who arrive in a Pennsylvania country town and try to induce local landholders to lease the rights to their property for fracking the drilling process that can unearth millions of dollars from cow pastures while threatening to pollute the underground water and damage animals and crops.
NEWYORKER: Promised Land