What goes up must come down. We know that in a billion years the sun will be hotter. At some point between now and then we will be finished (ignoring Musk as at the best a few survive, less as likely than life forms on other galaxies). If we accept that we are at some point going to come down then we can start looking at the details of our shorter species survival.
As of now, we have created a bad segmented system, Nation states and the dominance of economy over culture and family make our current situation unworkable.