The World Meteorological Organization, the weather agency of the United Nations, announced on Wednesday that 2015 is the hottest year on record, breaching the symbolic and significant milestone of 1 degree Celsius above the pre-industrial era. The report comes the week before world leaders assemble in Paris to try to negotiate an agreement to fight climate change. Records go back to 1880.
As reported on CBS News on November 25, 2015.
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