Ah, SimCity 2000. I friend of mine totally punked me once by explaining that if you managed to get a population of 100 million, then you'd unlock the "Emerald Arcology" which looks like Emerald City from Oz. So I tried for weeks to get up to that level, but keeping count of how many launch arcologies I had built (my goal was to build right up to but not surpass the allowed number before they lift-off, then build nothing but Plymouth arcologies after that) was such a pain.
Then I bought a strategy guide out of frustration, and found that it had nothing about the Emerald Arcology. I suspect that it doesn't actually exist...
I remember reading a science fiction story about how the big cities of Earth were fitted with interstellar drives and flew away. I wish I could remember the name. It's part of a series, and it's a real classic too.
It's called "delta-vee" Jeb, and you're out of it.
I remember I read something about vertical farms.
Instead of having 100 m2 of farmland spread over ... 100 m2... of the planet, we could have four little 25 m2 patches, but stacked vertically. It's feasible, as long as you have a good water supply, good structure for the land, etc., etc.
I doubt it. I figure we see underwater colonies before true arcologies, and with our population cap an estimated maximum of 40 billion, I don't think we could get a high enough population that it would be more economically feasible to build an underwater colony, much less an arcology, instead of just another suburb. I mean, I live in the Midwest, there are literally miles of completely unused land (not even farms) stretching out in every direction. It would be way cheaper to build a new city there instead of on top of a preexisting one.
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