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This NOAA satellite image taken Tuesday, Oct. 30, 2012, shows superstorm Sandy slowly moving westward while weakening across southern Pennsylvania. The National Weather Service said a foot and more of snow was reported in lower elevations of West Virginia, where most towns and roads are. High elevations in the mountains were getting more than two feet and a blizzard warning for more than a dozen counties was in effect until Wednesday afternoon. (AP Photo/NOAA)

Global warming

Global warming is leading to such severe storms, droughts and heat waves that nations should prepare for an unprecedented onslaught of deadly and costly weather disasters, an international panel of climate scientists said in a report issued earlier this year.