No one denies the effect of water vapour as a greenhouse gas. In fact here has been a fair bit of research conducted on water vapour and it's interactions with other greenhouse gasses. Most notably, the feedback associate with CO2.
"Broecker and Lackner are leaders in the war on anthropogenic climate change and both advocate drastic changes in people�s carbon emissions and the dire need for large-scale carbon sequestration."
Now, why would one of the leading experts on atmospheric water vapour be so concerned about CO2 emissions, if it had no effect on our climate?
