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sides are divided on whether this warming is a benevolent and natural recovery from the Little Ice Age or a man-made "climate crisis"
The '''global warming''' warming issue is a political battle over the science of climate change. Liberals and conservatives in the U.S. are evenly split on the issue: 75% of Democrats believe that the science supports the [[anthropogenic global warming]] theory, while only 23% of Republicans believe the science supports it.
The '''global warming''' warming issue is a political battle over the science of climate change. Liberals and conservatives in the U.S. are evenly split on the issue: 75% of Democrats believe that the science supports the [[anthropogenic global warming]] theory, while only 23% of Republicans believe the science supports it.
In the general, the term ''global warming'' can be used for any upward trend in the [[global mean temperature]], but it is mostly used to refer to the 1°F warming since 1850, when the [[Little Ice Age]] ended. The two sides are divided on whether this warming is a natural recovery or the result of human activity (see [[greenhouse gas pollution]]).
In the general, the term ''global warming'' can be used for any upward trend in the [[global mean temperature]], but it is mostly used to refer to the 1°F warming since 1850.
The two sides are divided on whether this warming is a benevolent and natural recovery from the [[Little Ice Age]] or a man-made "[[climate crisis]]" (see also [[runaway greenhouse effect]]).
==The modern warm period==
Average [[Earth]] surface air temperature has risen a little less than 1 °C since 1850.
Average [[Earth]] surface air temperature has risen a little less than 1 °C since 1850.