Nah. The most pessimistic prediction would be that we have already passed the point of no return to the region of positive feedback and the planet is on its way to become a second Venus soon.

Operating with this prediction we should just go on with business as usual and enjoy the last couple of decades.

More seriously, I strongly disagree with the "we can shrug" part. The more realistic (than the above) very pessimistic predictions would require that the human population should be reduced very much and that our way of living should be changed dramatically and very quickly in many respects, transport, food production and all that. If these measures are applied very quickly, the consequences would likely be worldwide mass deaths by starvation and cold. That is not what I consider "we can shrug" off in case of error.

It is in principle wise in my opinion to err a bit more on the pessimistic side, but what we can do always comes with costs and not only with benefits. So I'd do what can be done with low costs (better isolation, less fuel cars, increasing costs of transport even if the British Mudcatters shout at me) and has also additional benefits like independence from OPEC.

As a political leader I'd assume
(1) that the middle of the road predictions are the best guess and
(2) that the most extreme models that require immediate and drastic measures are plainly wrong.

That has two advantages:
(1) If I err on (1) it doesn't matter much if I am right on (2) which is very likely, for more drastic steps can still be implemented some decades later with better data.
(2) This is the only policy the population will tolerate without a revolution. Any much more drastic policy could only be implemented by brute force and I'm not sure the police and army would follow me.

Even if my policy was wrong and the correct action would be a policy that leads to 1/3 of the wordl population dying within a short time, only a brute force world dictatorship could make it at high costs.

This is actually discussed among some German environmentalists, mainly from the political right. We call them ecofascists.

Wolfgang