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[quote user="neil300"]If i read correctly itwas stated earlier that water vapor is the main cause of global warming. Isn't that the exhaust of the Hydrogen fuel-cells that people have been touting as the future of "green power" for cars? They say all it produces is steam, right?[/quote] You raise a good point, and I too am somewhat confused about what is being objected to in terms of water vapor.  In looking into the role of water vapor, I first thought that water vapor produced by man was the issue.  But now I am not sure if it is.  The references that I have found make the point that man makes CO2, CO2 makes global warming, global warming makes water vapor, and water vapor makes more global warming.  So I think the basic objection to water vapor is the water vapor made by manmade global warming, rather than water vapor made directly by man such as steam exhaust.  I have not found any reference that cites an objection to water vapor made directly by man.  But the matter needs to be clarified.
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