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{{merge|greenhouse gas}}

{{merge|greenhouse gas}}

The '''greenhouse effect''' refers to the retention of heat at the [[Earth]]'s surface and in the [[atmosphere]] which results when gas molecules reduce the escape of [[infrared radiation]] into [[outer space]]. The greenhouse effect was discovered in 1824 by [[Joseph Fourier]].   

The '''greenhouse effect''' refers to the retention of heat at the [[Earth]]'s surface and in the [[atmosphere]] which results when gas molecules reduce the escape of [[infrared radiation]] into [[outer space]]. The greenhouse effect was discovered in 1824 by [[Joseph Fourier]].  The effect was disproven by German scientists in 2007 [http://www.newsmax.com/archives/articles/2007/8/6/104929.shtml?s=lh].

These [[greenhouse gas]] molecules (principally [[water]], [[carbon dioxide]], and [[methane]])  

These [[greenhouse gas]] molecules (principally [[water]], [[carbon dioxide]], and [[methane]])