Fifty-feet-higher sea level means a much bigger bay, more tidally confused, Hell Gate more hellish, the Harlem River a wild tidal race and not a shipping canal, the Meadowlands a shallow sea, Brooklyn and Queens and the south Bronx all shallow seas, their prismatically oily waters sloshing poisonously back and forth on the tides. Yes, a total mess of a bay, still junked up by bridges and pipelines and rusting sclerotic infrastructural junk of all kinds.
