What is that? A squirrel? Chipmunk?
sxan
Rust needs to be reduced back to ore, using a reactive, usually coke. Coke is purified coal. Coal is a fossil fuel. You can do it with charcoal, which can be made by burning wood, so it's possible without coal, just not as efficient. This assumes you can gather the rust - it tends to break down and disperse into the environment, but if you broke up concrete to get at rusted rebar and could collect the rust, you could reduce it with charcoal.
Again, it's a matter of scale. We mine iron and deposits because we can get large amounts in seams. If you're trying to harvest rust and reduced it with charcoal, you're producing iron on the scale of making knives and swords, not cars, or combine harvesters, or more rebar.
It's a chicken-egg problem. We have been able to come as far as a have because oil, coal, and iron were just laying around on the surface, in huge quantities. Those are gone, and now you need the big tools first to get at the reserves that are left.
Any worked iron product rusts. If we're talking about evolutionary time scales, any exposed metal - which is most of it - is going to be unusable within thousands of years, and even rebar embedded in concrete will be gone in millions. Heck, our concrete isn't even as good as the Romans', and even that's going to break down in thousands of years.
We've stripped the raw, surface, easily accessible stuff and worked it into things that will degrade. There may be some scavenge, but nothing that can be gathered in any quantity to build an industrial society on. At best, future societies will be like medieval Japan, where iron is rare and steel precious and hoarded, only unlike Japan, there won't be a future where they can import huge quantities of the stuff from China or Australia, because getting to the deposits now requires an industry and advanced mining equipment... which is all made out of iron they won't have.
Gold will be interesting. Again, it's not just laying around everywhere just under the surface. Instead, there will be isolated pockets of huge piles of the stuff. Gold doesn't degrade, but it's all hoarded. There's a bunch in electronics, but in tiny, tiny amounts in each device; trying to salvage that is really hard, and yields trace amounts. No more nuggets the size of your thumb, or your fist. If a future civilization could build a global economy, then gold wouldn't be an issue. Uranium will be hard, as will platinum, and platinum is a useful, but consumable, catalyst, and rare even today it'll be almost unheard of in a perpetually pre-industrial post-apocalypse.
Fossil fuels are going to be the big issue, though. What's left will simply be inaccessible, and without fossil fuels you don't have plastics, industry, fertilizers at scale, global transportation, or the ability to work whatever metal you can find, at any scale.
It's pretty nice, although IME it's really crashy.
Thank you. I don't know that I ever knew that statistic about Greenland's population. The nuke statistic tossed around - that I always heard - was something like "there are enough nukes to blow up the world a million times," with is a silly, sloppy metric that doesn't day anything about the actual warhead count. Are those Tsar Bombas, or Fat Man? How many megatons are required to "blow up the world" once? But that graph is interesting; it's even more interesting that there population of Greenland and the number of (viable) warheads on the planet have been so relatively close.
I mean, if that's how you get your rocks off, you do you. Personally, I've never found vitriol to be in any way healthy.
The biggest challenge for future intelligent species, and the reason why I know we're the first technological ones, is that we've mined all of the easily accessible metals and all of the easily accessible fossil fuels. Any intelligence arriving after us is going to have to make a civilization without iron, precious metals, oil, or coal. Unless you get into some sci-fi bio-engineering scenario where they're growing high tech, they're doomed to being stuck in the stone age. It's going to be hard for them to escape the planet, defend it from asteroids, deal with super-volcanoes, build advanced calculating devices... all of the stuff we would already find challenging even with all the resources we have.
Millions of years are not enough to replenish the fossil fuels, and the sun is going to start expanding before enough life lives and dies to produce any useful amount of biomass. Before then, more metals will become accessible, in places, but good luck working it at industrial levels without fossil fuels.
I'm not saying it's impossible, but we've given a severe handicap to advancing beyond a rudimentary agrarian society for any successor species; even if it's our own descendants re-arrising from a post-apocalyptic environmental catastrophe.
"You're not obligated to respond", combined with "nobody else cares about your quarrel but you and that idiot" are the two maxims that make my social media experience better. Sometimes I feel like arguing, but if I think someone's arguing in bad faith, I just block 'em.
Life's too short to spend time interacting with morons.
But why would you have thought that? There have always (for recorded history values of "always") been people in Greenland; there have only relatively recently been nuclear warheads. So - regardless of truth - why would you have assumed that there must have at some point been more warheads in the world than people in Greenland? That doesn't seem like an obvious assumption, to me. What made that occur to you?
I wish I'd have come across this in poster form! I'm not sure where I'd hang it at my stage in life, but this is Art.
Calibre is one of the great pieces of FOSS software, and demonstrates everything good about FOSS: it has regular updates; it's been around for simply ages; it works really, really well; it gets updates and new features and yet has never in my memory had a breaking, non-backwards-compatible release... it's stable; and it resists - in its way - the attempt by publishers to steal our rights and ownerships of our media.
I ~~contribute~~ donate to Calibre. I hope that Goyal has a successor lined up to take the helm who can continue such an outstanding contribution when he finally retires from the project.
Edit: clarification
I admire your bravery, and your determination. I hope you and your family, your friends, and your community stays safe and well.