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see global warming theory
[[Image:Orange sun large.jpg|right|thumb|250px|Orange sun]]
[[Image:Orange sun large.jpg|right|thumb|250px|Orange sun]]
'''Global Warming''' is any increase in average air temperature at the [[Earth]]'s surface over a period of decades or more. Since 1989, advocates have clashed on the issue of whether human beings are more responsible than nature for periods of global warming since the [[Industrial Revolution]].
'''Global Warming''' is any increase in average air temperature at the [[Earth]]'s surface over a period of decades or more. Since 1989, advocates have clashed on the issue of whether human beings are more responsible than nature for modern periods of global warming; see [[global warming theory]].
As an issue, it is a political battle over the science of climate change and is mainly used to justify support for the [[Kyoto Protocol]].
As an issue, it is a political battle over the science of climate change and is mainly used to justify support for the [[Kyoto Protocol]].