This kind of touches on a problem that's been stewing in my mind for the last year or so. How is New York City going to deal with climate change? By the end of the century water levels are going to rise by up to six feet. That's significant! It could put many neighborhoods literally underwater, but beyond that the infrastructure - subways, sewers, etc. - could face significant problems.
Relevant quote from the article:
“Sponge cities can maybe deal with sea level rise of one or two meters, but five meters? No,” admits Kongjian. “But if the sponge city can’t stop it, nothing can. You have to move the city away.”
It's possible we see NYC just... move away from its current position within our lifetimes.