Gareth,
Perhaps you agree with the popular laymen's POV (espoused by liberals, Democrats, environmentalists, etc.) that there is a massive majority of informed scientific opinion that believes in anthropogenic global warming. But YOUR AGREEMENT with that viewpoint is insufficient reason for the Wikipedia to endorse it.
Rather, we should consult surveys to see whether or not such a "massive majority" exists.
Some people, such as you and Fred (if I recall correctly) seem to believe two apparently contradictory things:
(a) that no surveys of scientists' GW theory acceptance have been conducted, and (b) that there's a "consensus" of scientists who accept GW theory
You can't have it both ways.
But if there is some prominent figure or organization which holds both those beliefs, we can mention that in the appropriate article.
The same article, however, should mention the EXISTENCE of surveys - even if this makes holders of the "no surveys conducted" POV look foolish. It's kind of like the flat earth thing. We mention believers in flat earth, where appropriate, but we point out that their belief has been discredited.
Ed Poor