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Explosion and meltdown fears at Japan's quake-hit Fukushima nuclear plant renewed debate about the safety of atomic energy Sunday and cast doubt over its future as a clean energy source.
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Climate change is rapidly transforming the Arctic and the U.S. Navy is falling behind as international powers jockey for power over vast oil resources.
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The H1N1 swine flu that swept the globe in 2009/10 could easily morph into a more transmissible form, while an older, mid-20th century virus could also come roaring back, scientists warn.