Waterfront on the move

Flooding of Coast, Caused by Global Warming, Has Already Begun - The New York Times

This is a pretty good article talking about the already increasing coastal flooding in America.

I am very curious as to whether economists with their "future costs of climate change" work can really have any firm basis on calculating the obviously high potential cost of works to hold back the sea.  We're not talking little old Holland here, with its puny length of coast line.