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Yeah, I don't know of any technology capable of holding back nearly a foot of water. Hopefully they figure it out before it's too late for Miami.

The technology exists, but it wouldn't help Miami. The city is built on porous limestone, so even encircling it with a 50' wall wouldn't do anything.

Maybe Miami will be the new Venice :)

You can find a below sea-level hole inland then redirect the water to it.