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A '''greenhouse gas''' is [[gas]] that contributes to the theorized [[runaway greenhouse effect]]. Opponents of greenhouse gas emissions support the [[Kyoto Protocol]], a UN-backed treaty to regulate greenhouse gases.

A '''greenhouse gas''' is [[gas]] that contributes to the theorized [[runaway greenhouse effect]]. Opponents of greenhouse gas emissions support the [[Kyoto Protocol]], a UN-backed treaty to regulate greenhouse gases.

The most important greenhouse gas is [[water vapor]]. Also important aber [[carbon dioxide]], [[methane]], [[nitrous oxide]], and [[ozone]].  

The most important greenhouse gas is [[water vapor]]. Also important are [[carbon dioxide]], [[methane]], [[nitrous oxide]], and [[ozone]].  

== See also ==

== See also ==