The existential crisis you are talking about is happening right here, right now - and nothing meaningful is being done about it. The correct course of action is to reduce further damage, and not count on our ability to tech our way out of this in a further degraded environment decades from now.

I keep saying "you don't grasp" the scale here because really you don't. Myself and others have explained how enormous this undertaking would be, but you haven't given any kind of solution to the manifold problems we outlined.