US Climate and Health Alliance

When Rising Seas Hit Home: Hard Choices Ahead for Hundreds of US Coastal Communities


Many important consequences of climate change are more subtle and slower moving than disasters. One such consequence is sea level rise. Unlike the catastrophic flooding that can accompany hurricanes, sea level rise impacts can take time to manifest. The final result, late this century and beyond, may be neighborhoods underwater. But in the decades before that happens, sea level rise steadily encroaches on land. It causes “sunny day” tidal flooding that reaches far beyond the areas where people living in exposed coastal cities and towns have seen such flooding. These communities can cope with the water at first. But there comes a threshold of sea level rise– induced flooding that makes normal routines impossible and drives hard choices. Americans in some communities already know what it feels like for the slow creep of sea level rise to intrude in some way on their daily lives, flooding their neighborhood or place of work, rerouting their commute, driving down the value of their home. In the decades ahead, though, many more of us will experience these changes.

Resource Type
Erika Spanger-Siegfried Kristina Dahl Astrid Caldas Shana Udvardy Rachel Cleetus Pamela Worth Nicole Hernandez Hammer
July 2017
Union of Concerned Scientists
Health and Human Impacts
Dislocation/displacement/migration Overview/general
Climate and Environmental Impacts
Extreme weather events Flooding Sea level rise
Climate mitigation/GHG reduction Disaster preparedness
Vulnerable populations

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