We aren’t. Water vapour is a greenhouse gas that, in conjunction with carbon dioxide, nitrous oxide, methane, and ozone, absorbs and emits thermal radiation in the phenomenon known as the greenhouse effect to warm the earth’s atmosphere.
Increased levels of carbon dioxide from the burning of fossil fuels have contributed to an accelerated warming effect, according to the theory of global warming. Current environmental campaigns and legistlation aim to reduce the amount of CO2 emitted to slow and/or stop this process.
Although water vapour accounts for the largest percentage of the greenhouse effect (36-85% depending on clouds), human activity does not significantly affect levels of water vapour in the atmostphere. An exception would be irrigation affecting local levels of water vapour, but isn’t significant on a global scale.
“Water vapour: feedback or forcing?”. RealClimate. 6 April 2005. http://www.realclimate.org/index.php?p=142.
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