FILE - This Aug. 14, 2010 file photo shows an aerial view of the flooded Rohjan area in southern Pakistan. U.N. climate experts say global warming accelerated since the 1970s, breaking

 

              FILE - This Aug. 14, 2010 file photo shows an aerial view of the flooded Rohjan area in southern Pakistan. U.N. climate experts say global warming accelerated since the 1970s, breaking
FILE - This Aug. 14, 2010 file photo shows an aerial view of the flooded Rohjan area in southern Pakistan. U.N. climate experts say global warming accelerated since the 1970s, breaking more countries’ temperature records than ever before. The World Meteorological Organization’s analysis Wednesday, July 3, 2013 calls the first decade of the new millennium an unprecedented era of climate extremes ranging from heat waves in Europe and Russia, to droughts in the Amazon Basin, Australia and East Africa, to huge storms like Tropical Cyclone Nargis and Hurricane Katrina.(AP Photo/Khalid Tanveer, File)