A setting for a story: Miami 2049. Shining towers rise from the sea, a glass archipelago. On the lower stories, buffeted by the sea, glass has been replaced with stout timber, purchased from the mainland, but higher up the old glass still gleams. If you look closely you will see missing panes here and there; in Miami, breaking a window isn’t just bad luck, it’s reason for exile.
Some of Miami’s towers have have fallen in the storms; others still stand tall, each a city-state.
All around them, the sea. Once teeming with fish, perpetual algae blooms have robbed the water of oxygen. All that’s left is algae and whales that eat algae. Suddenly-prosperous whales seem more organized than they used to be.
Algae is the blood of this place. Each building has a small fleet of algae harvesters, plying seas once rich with fish to provide protein for the starving masses on the mainland, now 100 miles away and receding. Protein is worth a premium, and what is left of Miami is prosperous.
Below the surface are streets still clogged with cars, and drowned shopfronts where once was sold for a premium things which have no value now. Gadgets and fancy clothes. Two stories up, piers extend from the glittering city-buildings, providing a place to load cargo, but offering no shelter from the all-too-frequent storms. It is widely accepted that once ocean temperatures find a new equilibrium that the storms will return to the relatively benign level of fury known in the 20th century and before, but the people of Miami have learned not to wait for that to happen.
The buildings’ bosses can efficiently control access, both at the piers and in the stairwells. Socially, building-states are insular, with two exceptions: There is a complex system of taboos governing sex and enforcing the exchange of women between buildings, and there are some tradesmen, primarily doctors and merchants, who can move between the buildings relatively freely. Of course, wherever they go, they are quizzed about the other buildings, but the smart ones know that those who tell tales won’t be in business long.
Out on the sea the algae harvesters have their own society, quite distinct from the structure in the archipelago. While the harvesters are not completely separate from the building-state rivalries back home, they have their own ethical code while out on the sea. Because of the wealth they bring, they have a level of autonomy other citizens do not.
There is still enough tech that they know when storms are coming. It has been a couple of years since a building toppled, but the possibility is real – though the greatest risk was when the surf lapped at the buildings’ foundations.
When a building falls, the city pulls together to save the victims. And if your building rescues particularly valuable citizens, all the better. Spoken out loud is a strict ethical code regarding helping a drowning neighbor, but some building-states might not honor the intent, even while they honor the letter.
So there’s a setting, one I rather like. If someone were inspired to use that setting for a story, I’d be right pleased.