Not an ad-hom because it was a corollary to the fact that they didn't understand the science, which I explained above. And, there is no reason to be skeptical of the IPCC, other than "hunches" and "conspiracies". Or, you could try the long-debunked "Climategate" nonsense, but that won't get you far. Nope, there really isn't a reason to distrust the IPCC, whose staff are not even paid (well, the vast majority).
They don't claim 100% consensus, either.
The real reason I started this thread was not to proclaim my "unequivocal belief" in the IPCC, I started it to state my anger that the USA and other major powers aren't doing much to cap carbon emissions.