The reconstruction of nearly four blocks of A1A in Fort Lauderdale is a perfect example of how cities are responding to rising sea levels. It is also an example of how costly and damaging the problem can be.

The project north of Sunrise Boulevard between Northeast 14th Court and 18th Street, part of the city’s recovery from Superstorm Sandy, has a price tag of $8.3 million. Once the work is completed, A1A will have one northbound lane, one southbound lane, a turning lane, and a northbound bike lane.