Rising sea levels

Coastal cities across the globe are looking for ways to protect themselves from sea level rise and extreme weather. In the U.S., there is no set funding stream to help — leaving each city to figure out solutions for itself.

New Orleans and Philadelphia are two cities that face very similar challenges of flooding from rising tides. But they've chosen to pay for the solutions in very different ways.

New Orleans: Post-Disaster Payments And Grants Pave Future

Bellamy Pailthorp / KPLU

It’s one of the more dramatic-sounding aspects of climate change: as carbon emissions and other greenhouse gases speed up global warming, sea levels are expected to rise too.

A new study suggests that sea levels are rising at an unprecedented rate and that the problem will continue well into this century.

"Sea level rise in the 20th century was truly extraordinary by historical standards," says Bob Kopp, an associate professor of Earth and planetary sciences at Rutgers University, and who is lead author on the study, which appears in the journal Proceedings of the National Academy of Sciences.

Update: The original version of this story incorrectly summarized this study as showing populations to be displaced by 2100 if current trends continue. Author Ben Strauss sent the following correction: "by 2100, we would most likely be *locked in* to such an outcome in a more distant future, time unspecified, but essentially inevitable." We have updated the story accordingly. 

The warming climate is causing sea levels to rise as oceans expand, and, combined with more frequent storms, the effects could be devastating.

A new map shows more than 1,400 towns in the U.S., 30 in Washington state, where half the population will be displaced  if current trends continue through the end of this century.

Thousands of homes in Washington and Oregon could be inundated by rising seas caused by global warming over the next century, according to research by the non-profit Climate Central and the University of Arizona.

By calculating how many Americans live less than 1 meter above the high tide line, the researchers found 10,500 homes in Washington and 7000 in Oregon that would be flooded by rising seas.

The biggest concentrations of vulnerable homes are in Seattle, and Warrenton and Seaside, Ore.