Surface Temperatures Have Warmed Over the Past Century

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Global Mean Surface Air Temperatures, 1865-1995

It is generally accepted that the planet has warmed 0.3 degrees C to 0.6 degrees C over the past century or so. For more information see http://www.wri.org/trends/climate1.html.

Source: University Corporation for Atmospheric Research (UCAR) and the National Oceanic and Atmospheric Administration (NOAA), Reports to the Nation: Our Changing Climate (UCAR, Boulder, Colorado, 1997), p. 20.