Actually, you are wrong
Most of humanity that exists away from the extremes you describe, aren’t concerned. There is no valid reason to fear the end of human habit or of Humanity. It just isn’t going to happen
Chicken Little is well known to be a hoaxer
“It just isn’t going to happen”
We are overdue for the next periodic ELE (Extinction Level Event), most likely an asteroid strike. In any event, humans will become extinct sooner or later until and unless humans inhabit extraterrestrial homes beyond the reach of any single calamity.