climate change isn't an one/off effect but gradual

every bit of improvement is a higher chance to avoid some of the most catastrophic outcomes (where the unlikely but possible worst outcome being a mass extinction chain reaction which humanity will find very very hard to survive in a functioning manner/without losing their future)

so still worth fighting for any improvement even if we can't avoid a catastrophe anymore, as there is a huge margin between what we still can archive, and what we might end up with if we stop fighting and are quite unlucky

I agree, it's worth doing everything we can.

But it's also clear, it won't be enough. Emissions are not only still increasing, they likely won't stop increasing in my lifetime (in the next 50 years.)

We must adapt. The earth is going to get a lot warmer, and wetter in some parts, and drier in others, and sea levels will likely keep slowly rising for many centuries to come, if not millennia.