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Driven by new regulations and fracking, more coal power plants are retiring for cheaper, cleaner-burning natural gas. But scientists have yet to work out the fossil fuel's imperfect climate footprint.
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The report says there are few incidents of tainted water given the number of wells. Energy companies agree. Environmentalists accuse the industry of undue influence over the study.
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Mexico has opened up its oil and gas fields to foreign investors. But they're slow to enter, as low oil prices, drug violence and other challenges trump the lure of a vast and undeveloped shale bed.
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As oil prices dip, controversial and relatively expensive production methods, like oil sands and fracking, have become less profitable. Some drillers are already cutting back on plans for more wells.
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A jury awarded nearly $3 million to the Parrs, who say leaks at a natural gas site made them ill. The family won the suit without having to prove that the drilling company broke environmental laws.