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Periods of global warming have been measured in modern times at weather stations throughout the world, since the invention of the [[thermometer] by Gabriel Fahrenheit
[[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. 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]].
'''Global warming''' is an increase in average air temperature at the [[Earth]]'s surface. Periods of global warming have been measured in modern times at weather stations throughout the world, since the invention of the [[thermometer] by [[Gabriel Fahrenheit]] (1686-1736).
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==