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As far back as temperature records can be reconstructed, periods of global warming and global cooling have alternated; see ice ages and interglacial warming.
[[Image:RobinsonWhatWarmsTheEarth.gif|right|frame]]
[[Image:RobinsonWhatWarmsTheEarth.gif|right|frame]]
'''Global Warming''' is any increase in average air temperature at the [[Earth]]'s surface over a period of decades or more.
'''Global Warming''' is any increase in average air temperature at the [[Earth]]'s surface over a period of decades or more. As far back as temperature records can be reconstructed, periods of global warming and global cooling have alternated; see [[ice age]]s and [[interglacial warming]].
==Controversy==
==Controversy==