Look for common ground. Then I think you will see why fear of AGW is alien to reason.
Global warming alarmism has always been a matter of choosing the least significant contributor to global warming — CO2 — and then creating mystical properties that are not observed in nature. The magic properties of CO2 are achieved by applying magical magnification formulae such that the scant contributor may become the source of a peril called AGW.
Nothing in natural science can explain why we would do this if the peril of AGW is not really there. However, we can only look beyond the natural sciences for an explanation if we think that the peril is really not there. Contrary to that, of course, will be the belief of the inventor of a peril that the rest of us simply do not recognize the peril and that will always be the case and is the reason we have the scientific method to begin with: to help us differentiate between reality and religion.
Accordingly, in the context of AGW theory, reason requires that we must try to explain why anyone would choose a scant contributor as the cause of a non-existent peril in the first place. It is only by virtue of this sort of analysis that we may alight upon some common ground of understanding and discover if we are in fact even dealing with matters of the physical world at all.
What we learn in general is that by the process of simply naming a peril we invest it with an existence. Moreover, there must be some compelling reason to keep its newly-minted existence alive or it will die.
The reason the Left created the peril that is the crisis of AGW was necessary for their purposes of arguing against capitalism. The fact that the peril was created out of whole cloth and relies on magic formulae – like ‘climate sensitivity’ — to support is existence is irrelevant to the usefulness the peril. The value of AGW theory to the Left is that it helps the inventors of the peril achieve their ideologically-motivated purposes.