movies

... personally, i wish aliens would show up and be like, "bruh." to save a sapient biosphere from extinction.

But I don't actually believe it'll be that.

Probably more likely a total systemic collapse of the United States of America due to its critical infrastructure crumbling past a point where its economics can adapt resulting in a stock market crash that wipes out entire industries. Then a cascade failure of all the nations that were still relying upon them to remain functional that crashes just about every OTHER economy across the entire planet (though potentially not china maybe) and leaves almost the whole population of our entire species to fend for ourselves.

After the initial riots disable urban centers and local peacekeeping forces fail to quell them, the bureaucrats wholly owned by corporate sponsors will go full mask-off and call in private security contractor shock troops to exterminate the uppity peasantry and brutalize any survivors back into submissive complicity. Anyone who didn't fight will be targeted for detainment via guilt by association. Personal property will be seized "for peacekeeping purposes" and anyone who isn't working for the corporations or mounting a strong enough resistance will be captured and concentrated in forced labor camps.

Billions of us will die, possibly even more than half of our entire species, whether from lack of critical support systems (lack of food, potable water, medical care, and/or shelter that can protect them from extreme temperature), by exploitation of warlords rising to fill local power vacuums (including corporate-owned city-state enclaves), or in conflict between corporate enclaves and said warlords, all exacerbated by hotter and longer heat waves and droughts, deeper and sharper cold snaps, HARSHER storms, BIGGER fires, MORE floods, rising sea levels, and no organized reconstruction efforts.

There may or may not be a few madmen who decide to pull the doomsday triggers and kick off a global thermonuclear exchange out of impotent rage that despite all their destructive power they're still about to lose everything and are lashing out in hopeless desperation.

2036 heralds the watershed moment that people realize we've entered the new dark age. There is nothing we can do to stop it, but if you start right now, you might prepare yourself and your local community to mitigate the hardship... even if only temporarily.