If shit goes to hell, it's just going to be 15 minutes of sheer panic, with nothing to do about it or change it. Why worry your entire live about it? I personally take steps for all the things that can make a small but meaningful change in my life and people around me (carbon emission and footprint wise). If a large enough number of us do that, then for sure there's a palpable benefit to all. but lie awake at night for fear that the powers to be are going to nuke the world? if it happens, it's gonna happen, hemming and hawing or not. Like Red said "get busy living or get busy dying".