It's question-begging to say
"If there is a catastrophic problem looming, and we can't adapt, we're probably screwed." Well, duh. But -- since my thesis is that your apparent principled derision for centralized solutions is misplaced and self-defeating -- I'm interested in the case where there is a catastrophe looming, and there are things that humanity collectively can do about it. (I'm especially interested because I think there's a good change that GCW may be such a case, although I don't know.) You formulated what appeared to be an attack on "the Al Gore camp" that depended for its plausibility on an a-priori dismissal of centralized solutions, and that's what I wish to dispute.
"[If] there is a catastrophic problem looming, the schemes will have to be so drastic and so draconian" Citation needed. I claim that there is no reason to believe that moderate action, taken collectively, cannot meaningfully improve our long-term outcomes. In fact, as a general rule of thumb, for arbitrary problems, I tend to assume that results generally improve monotonically with (productive) effort taken, although usually not linearly (and admittedly not ALWAYS monotonic). If the no-coordinated-action-taken path is ten feet of sea level rise, maybe with reasonable coordinated action we can limit it to 9. Or 1. Maybe with draconian and drastic coordinated action we can limit it to 5 or 0 respectively. If the no-coordinated-action-taken path is ecocide, maybe drastic action would be required to maintain our standard of living, but moderate coordinated action could improve from "ecocide" to "many disasters". In any of these cases, people gaming the system is a source of friction, and we should resist that, but not at the expense of tackling the problem!
So, then, usually coordination on things like environmental change requires a certain amount of majority-rules coercion. Libertarians might think it's better to die free, but most people seem to agree that sometimes this sort of coercion is worthwhile (but surely not for every little thing!). So reasonable people are left without the solace of blanket statements like opposing all centralized schemes without a cost-benefit analysis.
"That's certainly not the only reason I think Al Gore isn't an objective judge"
I didn't say it was the only reason, I said you made that attack. I think the context in which you made it makes it look like Al Gore is markedly unworthy of the trust we might place in a randomly-selected human (that is, I think you're proposing that we have extra reasons to mistrust him). I think that the very evidence of his investment is, in fact, a reason to trust him slightly MORE than a randomly-selected human.
And the (purported) conflict of interest (singular) that you point out is not a conflict of interest in a centralized scheme. That's completely missing the point. Even if people take action collectively, without any centralized incentive structure, green companies will profit. So arguments about gaming the system are generally not arguments against centralized action. People are taking decentralized action doing things like buying carbon credits for airplane flights. You think that's not being gamed? The question is how to take effective action, and then to coordinate people to take that effective action together.
"If there is a catastrophic problem looming, the best we can do is to try to figure out how to adapt."
That might be true, but it's not at all clear.
If there is a catastrophic problem looming, the best we can do is
* understand the scope of the problem, and the true cost to us
* understand what levers will move the problem
* make cost/benefit analyses of which levers we should move, and how hard
* coordinate people to take action, and hopefully share the cost somewhat "equitably" (including figuring out what that means)
Let me acknowledge that a large part of the cost to us is really "lose lives", "lose cities", "lose agricultural land", and thus "build levees, shift farms, etc" MIGHT be the most effective solutions. But I think that it's hard to imagine how high those costs will be.
(Especially considering that we're all gonna hafta get off the oil soon anyway, when it runs out.)