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see cloud cover
A '''greenhouse gas''' is any gas which contributes to the [[greenhouse effect]].
A '''greenhouse gas''' is any gas which contributes to the [[greenhouse effect]].
The most important greenhouse gas is [[water vapor]]. <ref>Water vapor has the largest greenhouse effect. [http://earthobservatory.nasa.gov/Library/glossary.php3?mode=all (NASA)] </ref>
The most important greenhouse gas is [[water vapor]];<ref>Water vapor has the largest greenhouse effect. [http://earthobservatory.nasa.gov/Library/glossary.php3?mode=all (NASA)] </ref> see [[cloud cover]].
Also important are [[carbon dioxide]], [[methane]], [[nitrous oxide]], and [[ozone]].<ref>http://yosemite.epa.gov/oar/globalwarming.nsf/content/emissions.html</ref>
Also important are [[carbon dioxide]], [[methane]], [[nitrous oxide]], and [[ozone]].<ref>http://yosemite.epa.gov/oar/globalwarming.nsf/content/emissions.html</ref>