A new analysis of 12 extreme weather events in 2012 found "compelling evidence that human-caused change was a factor contributing to the event" in at least half of them, according to Thomas Karl, ... more 
A new analysis of 12 extreme weather events in 2012 found "compelling evidence that human-caused change was a factor contributing to the event" in at least half of them, according to Thomas Karl, director of the Climatic Data Center at the National Oceanic and Atmospheric Administration. less 
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Thu, Sep 5, 2013 4:33 PM EDT