[TheCoelacanth]

$1 trillion is one year of Manhattan's GDP. Painfully expensive? Absolutely, but it's absolutely affordable over the course of a few decades.

The sooner we start, the cheaper it will be, so we shouldn't put it off, but it's not going to kill everyone or even convince everyone to leave NYC in the foreseeable future.

[jmclnx]

Yes, but NYC is nor the only city that need climate change mitigations :)

Factor in all other cities, how will that get paid and by how ?

Or do we chose which cites to save ? Other cities, tough to be you.