Posted elsewhere, and will presumably be scrubbed and flushed down a Memory hole.
The Appeal to Authority argument rests, inherently, on the demonstrated credibility and integrity of the Authority in question, in this case the IPCC, primarily.
This is why the scandals, such as Climategate–where the researchers primarily responsible for the Hockey Stick both claimed they would rather delete primary data than share it with anyone who might disagree with them, and who actively admitted they were trying to sculpt data–matter so much. The IPCC is CLEARLY politicized, and for the same reason you cannot infer from the fact that 100% of Koreans vote for their Generalissimo that they like him, you cannot infer from the fact that most professionals are on board with the IPCC, when being on board is a prerequisite to getting hired.