There are two processes, subsistence and sea level rise. In the Southeast United States subsistence, the lowering of land level due to settling of soil, aggravates the effect of sea level rise. Sea level rise is real and has been going on since the end of the last ice age. The Thames was once a tributary of the Rhine, their confluence was in what is now the North Sea.
Subsistence is especially bad around New Orleans which is built on silt. Places like Nantucket, Marthas Vineyard and Cape Cod are little more than glacial moraine, piles of sand 600 feet high deposited by glaciers during the last ice age. The sea is gradually reclaiming them.
“Sea level rise is real and has been going on since the end of the last ice age.”
Yes, but as someone else was getting at you’d never notice it unless you’re only 2mm tall.
“Subsistence is…”
I think you mean subsidence.