At least ten years ago, I read an online amateur science-fiction story. It took place in a near future affected by dramatic climate change.
Things I remember from the story:
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The US is balkanized.
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Cascadia in the Pacific Northwest becomes a country, and in one scene a pickup truck approaches the protagonist’s house with an unfamiliar blue, white, and green tricolour flag on the side, the flag of Cascadia.
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The rising seas create a larger Gulf of Mexico, a new bay covering what had been the lower Mississippi river. Near the end of the parts of the story I’d read, people were starting new fishing communities near the northern edges on this bay, climbing over the ruins of old cities to build their docks. Around this time, the weather in the area stabilizes into a new pattern based on monsoons.
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I seem to recall a long plot arc revolving around searching underground ruins for some kind of data that would help deactivate (?) some hazard (?) from the old days.
I think it was posted in parts on a forum devoted to climate change and green technology, but I’m not sure.
Can anyone help me identify and find it?