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One small enough to destroy a small country is enough to destroy the world.
What do you think happens to all the rock that was inside the crater before the crater was formed?
It doesn't just disappear, it's violently thrown out of the crater, some of it all the way into space where it rains back down on the earth, creating hundreds or thousands of smaller craters, it's called "ejecta"
Now, when all of this ejecta is thrown back to Earth and generates a lot of heat as it moves through the atmosphere, that heat has to go somewhere, so it warms the surrounding air raising atmospheric temperature. But, it's not the only thing doing so, remember all of those smaller craters?
Each impact releases enough energy to create a small firestorm, you now have thousands of small fires burning for thousands of miles from the initial impact. These will be the largest and most violent forest fires in recorded history. They will warm the atmosphere and release billions of tons of soot, this will be a problem in a few weeks.
As the fires consume everything and burn out things begin to cool down. The water boiled off from plants, rivers, and streams begins to condense into clouds and then rain. Acid rain falls across the world, poisoning areas that were lucky enough to survive the first few days. People, crops, and livestock start to die off in areas that were previously survivable. This lasts for a few weeks while the soot in the upper atmosphere cools the planet.
It continues cooling the planet until we enter a state of impact winter, which is the same as volcanic winter or nuclear winter but with a different mechanism behind it.
Depending on how big the impact and firestorms were, this could last between decades to centuries, then things start to return to normal.
If any humans survive at this point, we'll probably be starting over from the bronze age.
Eh, if there are human survivors then data (digital and analog) and technology will survive, as well as localized means of generating power. Between that and knowledge of post-bronze age technology existing in the minds of survivors (it doesn't have to be an understanding of how technology works, merely the idea that it exists is a huge head start since initially imagining a thing is the first huge hurdle towards creating it), I would bet on survivors not needing to reinvent so many wheels if we are also assuming the basic conditions necessary for a small number of humans to survive and reproduce indefinitely exist in this post-apocalyptic scenario. Bonus points if any of the survivors happen to be experts in a modern domain or two, but even the knowledge of basic maths that many people retain from adolescent education is a huge advantage over our distant ancestors. Just knowing that something is possible is enough to drive humans to figure out how to do it, and there would be scraps of all sorts of materials and things around to remind/inspire survivors.
That all isn't to say that I think day to day life would be at all functionally similar to life as it is now. Technology aside, just the sheer loss of population and infrastructure would mean modern convenience would be gone and life would initially be a brutal hands-on echo of the 19th century in many regards.
I don't really subscribe to the whole if civilization collaspes there will be no technology in anyone's lifetime again thing. You aren't going to go back to ordering shit off amazon from your smartphone or anything. However the knowledge that things like refrigeration, radio transmission, internal combustion engines, water treatment and such are possible is going to drive people to eventually find out how to get it by any means necessary.
How quickly this happens is a question of whether the majority of people adopt a "technology is too dangerous/a sin against God" idealogy or not.
One of the things missing from this step are all the incremental progress that is the best we can do at given levels of technology. I know LED lights exist and will help us extend our limited energy - but how does that help us with the necessary materials science, integrated circuits, fabs, or even how to build a reliable incandescent light in the meantime
Ok, I’m a programmer. What now? I will starve and die of dysentery long before I could help reinvent computers