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→The modern warm period
==The modern warm period==
==The Modern Warm Period==
[[Image:Artic 1979.jpg|left|thumb|275px|A computer projection comparing the Polar Ice Mass in 1979 (left) and 2000 (right).]]
[[Image:Artic 1979.jpg|left|thumb|275px|A computer projection comparing the Polar Ice Mass in 1979 (left) and 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.