The problem isn't strictly long-term rise. The big issue is the threshold where storm surges from hurricanes overwhelm our ability to block it and pump out what

The problem isn't strictly long-term rise. The big issue is the threshold where storm surges from hurricanes overwhelm our ability to block it and pump out what gets through. New Orleans is well into recovery from Hurricane Katrina, but the next direct hit will arrive inches higher than 2005 if it happens in the 2020s. How high does a wall need to be to block the storm surge of the monster hurricanes of the coming decades?