The folks I know who actually have the relevant deep-expertise have suggested to me that the IPCC's *worst-case* contemplated scenario is probably our *best-case* scenario at this point. ...Happy fourth!
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My understanding is that there are still degrees of even-worseness possible, but yeah, we've "baked in" a lot of bad things that are going to come to roost no matter what we do going forward at this point. SciCom people don't like that message, because it encourages fatalism.
(And I can sympathize with that. Fatalism results in apathy + inaction and that slides things into the even-worse land. In this as with nuclear issues, the tension between giving hope/agency and not omitting the nasty truth is a difficult one.)
