Environment
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Insight: The road to a greener America is littered with road-kill
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Insight: The fight for North Dakota's fracking-water market
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Powerful tornadoes strike in four central U.S. states
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Analysis: At margins of shale oil boom, a tempered euphoria
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EU energy chief says EU to look at fracking this year
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Analysis: Airline emissions deal may not come before EU deadline
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Extreme global warming seen further away than previously thought
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Belgian regulator to recommend reopening nuclear reactors -paper
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New fracking rules attempt to placate opposing camps
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Northeast Japan jolted by magnitude 5.9 quake, no tsunami warning
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