$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.
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.