I am not a doomer and so far I have not been diagnosed with brainworms or any other mental disability. Such insinuations does nothing to advance or clarify your position though, and maybe I misunderstood what you mean when you said: "All this is saying we have no idea what we are getting into with no plan an assuming it will all magically work out. It's completely self-centered and divorced from the totally of the biosphere."
As far as I can tell, nobody on either side of the issue has any sort of realistic plan to deal with it that is cogent and effective. We probably should be looking at ideas that attack the problem from both ends, reducing whatever anthropogenic activities that cause climate change but also whatever adaptations we can make to deal with the problem, whether caused by mankind or not. Unfortunately, the issue has become so political and toxic that we can't or won't agree or accept any proposals that the other side develops. Trust in science has eroded, as it also has in journalism, academia, and of course politics. Who knows what the truth is anymore?