Quote:
Originally Posted by avandonk
To even consider water vapour as a greenhouse gas is a totally fallacy.
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This will come as a surprise to the IPCC who on page 115 of the FAR Working Group 1 state (referring to the natural greenhouse effect):
'Water vapour is the most important greenhouse gas, and carbon dioxide is the second-most important one.'
I tried to find the relative contribution of each but so far the best have found is on a European Commission web page where it says that water vapour is responsible for 'about two thirds' of the natural greenhouse effect.
While looking that up I noticed that there is concern that water vapour increases caused by the rise in SST could produce a positive feedback and so enhance AGW.