NYC sinking is not really that outrageous a proposition.
Years ago there was a lot of talk that the area West of the Jefferson Memorial in DC was being flooded regularly from the Tidal Basin because the Potomac was rising due to global warming.
Turns out the area actually was sinking. Collapsing actually, due to shortcuts (like wood pilings that were deteriorating) taken during the memorial’s construction. Completely unrelated to global warming.
Iirc a while back, during the reconstruction of the WTC site, workers discovered a whole section of lower Manhattan that was built on the remains of 18th and 19th Century sailing ships that were deliberately sunk and covered over with dirt as landfill.
Interesting, thanks!