Environment
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Whole neighborhoods razed by Oklahoma tornado that killed 24
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Showers to slow U.S. corn seedings from blistering pace
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Shell feared disaster days before Alaska rig grounding: official
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China says its legal ivory trade not to blame for poaching
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U.S. pesticide makers seek answers as bee losses sting agriculture
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Drop in U.S. underground water levels has accelerated: USGS
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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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