New Orleans is sinking because the delta is eroding because they over managed the Mississippi. It has virtually nothing to do with sea level rise. It's about the worst example you could come up with.
I'm not sure about Miami, but it is probably an example of where a city shouldn't have been built in the first place. I don't think flooding is anything new there, either.
But yes, sea level changes. We should probably be prepared to adapt to it.
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