This is my perspective on the matter of "expertise": You are quite correct in saying that just because a body of people that are generally regarded as experts say this one thing, that does not make them right, but there is a problem here. The weight of authority carried by
the IPCC Any meritocratic pool of formally trained people in a technical field may not be fully conveyed to you. Disagreeing with
the IPCC said pool on the matter of
climate change the relevant topic is akin to disagreeing with biologists on the matter of evolution. That is often dismissed as hyperbole, but it is not, not even a little.
So the option I see here is this, either agree with the experts, or become one. Not that I am suggesting that you go out get a degree (although I would never recommend against it

), but rather a cogent, fact based, hard hitting argument is necessary. I have yet to see one presented. Rather I have seen a lot of made up data, poor analysis, a reflexive misuse of scientific concepts, self contradicting arguments, and more than a little contrarianism.