Environment
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Mountain air has high levels of ozone pollution, too
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Arctic grayling no longer critically endangered, thanks to conservation efforts
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Researchers dump oil into North Sea to study effects of oil spills
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Pangolins, world's most illegally-traded animals, will be eaten to extinction
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Study shows trees save many lives—are tree-huggers onto something?
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Americans are the biggest doubters of climate change, survey shows
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What caused the global warming 'pause'? Natural fluctuations, says scientist
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Gray seal population resurges, cheering a few but annoying many
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Obama opens Eastern Seaboard for oil search with a ‘sonogram of the earth’
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On the move: whale sharks find new home in more northern waters
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Dramatic decline in Indus river dolphins, irrigation and habitat fragmentation to blame
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Court clears controversial ocean seismic testing plan off coast of New Jersey
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