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Reverted edits by MatteeNeutra (Talk); changed back to last version by RSchlafly
'''Global warming''' is the term ascribed to an increase in the [[global mean temperature]]. Average [[Earth]] surface air temperature has risen by 1.4<sup>o</sup>C since 1905. 0.6<sup>o</sup>C of that warming has occured since 1975.
'''Global warming''' is the term ascribed to an increase in the [[global mean temperature]]. Average [[Earth]] surface air temperature has risen just over one degree since 1850.
<ref>Hansen's group at the Goddard Institute wrote, "Global warming is now 0.6 °C [1.0 °F] in the past three decades and 0.8 °C [1.4 °F] in the past century." http://data.giss.nasa.gov/gistemp/2005/</ref>
<ref>Hansen's group at the Goddard Institute wrote, "Global warming is now 0.6 °C [1.0 °F] in the past three decades and 0.8 °C [1.4 °F] in the past century." http://data.giss.nasa.gov/gistemp/2005/</ref>