The idea in stratospheric radiation management is just that. To keep the damage and effects in the stratosphere but there is no clear incentive as we show no signs of abandoning technology and civilization.
Without such a stance there is only one path forward which is accelerationism which tends to favor more conservative minds. The current modus operandi is liberalism and technology and as a result you are right to be critical of the current world order and especially the massive censorship and battering of humanity now occurring.
Without a holistic perspective there is no hope of ever rallying the right people or "solving" the problems. IE weaponizing populism in order to destroy technological slavery and end overpopulation and resource exploitation. Technology may be able to stop a good chunk of us before it goes under but all of the batter. You tackle two problems simultaneously.
Nobody or any specific organization or corporation or government has any authority over the trajectory of this planet and we will make that known with time. This isn't 1930 or something where fascism and communism runs wild across the world and people are off doing their own thing. Young people are about to shake things up but all of the things were going to be destroyed anyways.