Records of global temperature change are compiled by two American government agencies: the National Aeronautics and Space Administration, and the National Oceanic and Atmospheric Administration. Meteorological agencies in Japan and Britain also compile reliable temperature data. The analyses made by the agencies are based on thousands of measurements. The measurements come from weather stations, ships, and ocean buoys around the globe. Each group uses different temperature tracking methods but usually reach similar conclusions on the long-term effect of global warming. In 2016 in particular, the records collected by NASA were the most accurate. This is because NASA collected sophisticated data from the arctic. NASA is now able to have more reliable coverage in the polar regions of the world, which are greatly effected by rising temperatures.
“We expect records to continue to be broken as global warming proceeds,”- Michael E. Mann