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[[Image:RobinsonWhatWarmsTheEarth.gif|right|frame]]
[[Image:RobinsonWhatWarmsTheEarth.gif|right|frame]]
'''Global warming''' is an increase in average air temperature in the [[Earth]]'s atmosphere.
'''Global warming''' is a term generally used to describe an increase in the global average surface (air at surface) temperature.
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]].
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]].