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==The modern warm period==
==The modern warm period==
[[Image:Artic 1979.jpg|right|thumb|200px|Polar Ice Mass: 1979, Left & 2000, Right.]]
Average [[Earth]] surface air temperature has risen about 1° F since 1850.
Average [[Earth]] surface air temperature has risen about 1° F 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> How much of this is due to contamination of the temperature record from the [[urban heat island]] effect is hard to assess. Spurious warming trends that might be considered as global warming can occur almost anywhere. [http://climatesci.colorado.edu/2006/01/29/do-urban-areas-have-larger-long-term-temperature-trends-than-other-locations/feed/]
<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> How much of this is due to contamination of the temperature record from the [[urban heat island]] effect is hard to assess. Spurious warming trends that might be considered as global warming can occur almost anywhere. [http://climatesci.colorado.edu/2006/01/29/do-urban-areas-have-larger-long-term-temperature-trends-than-other-locations/feed/]