3-6 degrees Celsius by the end of the century U.S. National Oceanic and Atmospheric Administration scientists are also largely uncertain could be more like 3 degrees C 3-6 degrees Celsius by the end of the century 3-6 degrees Celsius by the end of the century U.S. National Oceanic and Atmospheric Administration 3-6 degrees Celsius by the end of the century will likely increase global temperatures could be more like 3 degrees C scientists are also largely uncertain NOAA Jan24/14 3-6 degrees Celsius by the end of the century predicted to double U.S. National Oceanic and Atmospheric Administration could be more like 3 degrees C scientists are also largely uncertain