Talked to a very smart person this afternoon who reminded me: climate fatalism ("it's too late") is a soft form of denialism.

Everything we do from here is worthwhile. It counts, it makes a difference. No matter what damage has been done, we can still make things better than if we had done nothing. We can still look after the world, look after our friends and family. Action has results.
@stephen depends, I now believe it is too late to stop it, now I am into how do we mitigate it and prevent it getting even worse, and I think that is a position of of people who think about it have reached.