Your conclusion that “promoting a vision of future galactic super civilization with immortal people could motivate people now to fight global risks in all forms” does not follow from your rhetoric and seems more like wishful thinking.
Conclusion is probably true, though the Glorious Future already has many promoters.
Conclusion is probably true, though the Glorious Future already has many promoters.
I would like to see some experimental evidence. In my experience it tends to be dismissed as science fiction.
Clearly the view has some traction. It seems likely that proselytisation would help.
Whether it is an effective thing to do is a bit of a different question.