Build seawalls
Move inland more
build storm barriers 30-90 miles out
build canals to take water inland or to lakes
Live away from beaches
Build offshore sea cities in LI Sound & off Staten Island for populace.
Move Manhatten commerce to Albany or Pittsburgh , away from Manhatten Island area.
Estd backups for Manhattten business, telecomm etc.
build artifical reefs to stem storm surges
OK wind farms near LI & Staten Island area for power
Acess Manhatten by RR, subway, bus & remove cars from Island.
Make Hwy connecting LI to Manhatten cutting through Harlem.
& more
Tear down older bldgs or house under domes or enclosures for Historic value.
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