NASA scientists are concerned that warmer than average surface sea temperatures in the North Atlantic and wildfires in the Amazon will lead to a more active hurricane season.

This brings with it concerns over sea level rise and flooding off the coast, which could cause significant damage to homes in these areas.

A.R. Siders, core faculty in the University of Delaware's Disaster Research Center, is one of the leading proponents of managed retreat as a strategy for dealing with this issue.

Retreat is often seen as a last resort. Managed retreat presents a set of options for communities to avoid building or living near areas that are vulnerable to sea level rise or flood hazards.