Global temperatures have risen so steeply since the 1980s that Arctic sea ice is now melting twice as fast as it once did. In a report released Wed., the United Nations says the world experienced ... more 
Global temperatures have risen so steeply since the 1980s that Arctic sea ice is now melting twice as fast as it once did. In a report released Wed., the United Nations says the world experienced "unprecedented climate extremes" between 2001 and 2010 with the last decade the warmest on record since the 1880s. Dean Reynolds reports. less 
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Thu, Jul 4, 2013 8:26 AM EDT