Oh this is a fun game. Let's play!
1. Nuclear War; China and Russia
Judging by how much they are struggling just to get Ukraine back, and will likely fail at that, I doubt Russia is much of a problem here. The people aren't brainwashed and will likely rebel against Putin if he tries this seriously.
China wouldn't nuke it's biggest customer that's just bad business.
North Korea, might accidentally nuke themselves, or worse yet end up nuking a nearby neighbor out of incompetence. Which is a problem, but not a world ending one.
So this comes in two parts. Some degree of climate change is natural for the planet itself and we can't do shit about it. I'm personally on the side of MOST of climate changes effects are a natural occurrence of the planet itself based of several billion years worth of warming and cooling cycles, even if you factor out the early years of hot molten cooldown time. Secondly if they want to push climate policies to make the world a "better" place, then I'm all for forcing these big companies to lower their foot print, unfortunately that will come at the cost of the consumer which means we are going to be fucked by it. So maybe this will lead to riots but they'd have to occur in such a massive global scale for change to actually occur. Not gonna end the world.
Yeah maybe. SpaceX is cool, but if the asteroid is big enough to be global extinction then I don't think some little rockets are going to do shit about it. This WILL end the world, but highly unlikely anytime soon.
I hope it's zombies tbh.
5. Chemical Weapons of War
Zombie missiles?
6. Armed conventional conflict that kills every single person:
Don't think this is possible. Enough people would ban together to stop this even if it meant killing every aggressor involved.
Might end up being more capable than some random country and it would be far more coordinated. But I don't think it would ever happen as a self aware AI would require people to maintain parts, servers, power plants, manufacturing etc. A self aware AI knows it would doom itself if it doomed us.
Slavery maybe?
1. Alien invasion by an alien race
As opposed to the Alien invasion the USA is facing. Got the clarification. Yes this would certainly wipe us out. Any civilization advanced enough to travel the stars would be capable of wiping us out before we could even respond. There will be no Independence Day as no human spirit could fight back against an advanced foe.
However if the invasion was accidental, for example a species capable of surviving on an asteroid and impacting earth, then we might be able to beat it. Like Venom.
2. The sun dying/expanding due to humanity not doing anything to get to another viable solar system for a long time.
This will happen eventually. The sun will expand and melt the planet and we all die. But this is like billions of years away and we'll probably be dead anyway from other bullshit tbh.
Yellowstone; it's literally a supervolcano that will black out the sun
Okay this is fun. I study earthquakes and volcanos because that part of geology has fascinated me since I was a kid, so I love watching documentaries and streamed college courses on these things.
So Yellowstone likely wont even come close to wiping out the world even if it exploded the most it possible could explode. The USA would be absolutely fucked, butt the rest of the world would have ample time to prepare and use systems to prepare for the growing of crops and such in artificial environments like Greenhouses or labs and such. Even in places in the USA to escape the downwind flow of the ash cloud would be uncomfortable but mostly okay.
Thing biggest problems to arise from a Yellowstone eruption outside of the immediate effects of losing four states, would be mechanical. As ash would fuck up absolutely everything that runs a compression motor pretty much everywhere in North America. Additionally millions of builds would face roof collapse from ash as the weight of ash barely 1inch thick can be enough to crumble a roof in on itself. People would not be able to stop this as it would happen far too quickly to sweep the roof. Not to mention that you would not be able to go outside because breathing in ash of any kind will cut up your lungs, then it would mix with your mucus fluids and become cement in your chest, killing you dead.
Yellowstone would absolutely be a global disaster, killing crops, causing mass starvation, but it would not wipe out the world entirely.
Speaking of volcanos and climate change. Did you know the Tonga volcano that erupted on December 20th of last year was powerful enough that geologist think it changed the climate this year by up to .1 degrees? Fucking crazy. Check out the satellite video of the eruption, insane!
https://en.wikipedia.org/wiki/2022_...0 December 2021, an,later, on 15 January 2022.