People should respond as if it is fixable, even if it is not. Any mitigation or reduction is positive. If you're gonna go out, go out swinging. Reject the status quo. Expect more from yourself and others.
The problem is fixable, but my biggest worry right now is that rich nations will do enough to save rich nations. They'll get most of their power from non-carbon based sources, pollute significantly less from industrial processes, protect their agricultural output, and switch 90% of cars on the road to BEVs. Then they just deal with the problems of increased flooding, wildfires, etc.
Meanwhile, the Middle East turns into a power vacuum because nobody wants their major export anymore. Africa starves to a level not seen in decades, or maybe ever.