Changes

==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.