Quantcast
Environmental News for a Healthier Planet and Life

Millions at Risk as Sea Levels Rise

Climate

Climate Central

Sea level rise due to global warming has already doubled the annual risk of coastal flooding of historic proportions across widespread areas of the U.S., according to a new report from Climate Central. By 2030, many locations are likely to see storm surges combining with sea level rise to raise waters at least 4 feet above the local high-tide line. Nearly 5 million U.S. residents live in 2.6 million homes on land below this level. More than 6 million people live on land below 5 feet; by 2050, the study projects that widespread areas will experience coastal floods exceeding this higher level.

Titled Surging Seas, the report is the first to analyze how sea level rise caused by global warming is compounding the risk from storm surges throughout the coastal contiguous U.S. It is also first to generate local and national estimates of the land, housing and population in vulnerable low-lying areas, and associate this information with flood risk timelines. The Surging Seas website includes a searchable, interactive online map that zooms down to neighborhood level, and shows risk zones and statistics for 3,000 coastal towns, cities, counties and states affected up to 10 feet above the high tide line. 

In 285 municipalities, more than half the population lives below the 4-foot mark. One hundred and six of these places are in Florida, 65 are in Louisiana, and ten or more are in New York (13), New Jersey (22), Maryland (14), Virginia (10) and North Carolina (22). In 676 towns and cities spread across every coastal state in the lower 48 except Maine and Pennsylvania, more than 10 percent of the population lives below the 4-foot mark.

Tidal gauge records show that the sea has already risen 8 inches globally during the last century, and projections point to a steep acceleration. “Sea level rise is not some distant problem that we can just let our children deal with. The risks are imminent and serious,” said report lead author Dr. Ben Strauss of Climate Central. “Just a small amount of sea level rise, including what we may well see within the next 20 years, can turn yesterday’s manageable flood into tomorrow’s potential disaster. Global warming is already making coastal floods more common and damaging.”

In addition to the Surging Seas report and website, Climate Central is releasing fact sheets laying out the risks for each coastal state. Staff scientists (Ben Strauss, Claudia Tebaldi, Remik Ziemlinski) have also authored two peer-reviewed studies being published March 15 in the scientific journal Environmental Research Letters, with co-authors at the University of Arizona (Jeremy Weiss, Jonathan Overpeck) and the National Oceanic and Atmospheric Administration (Chris Zervas). In addition to hosting the map tool, the national report, state fact sheets, and the peer-reviewed papers, the website, SurgingSeas.org, includes downloadable data for all the cities, counties and states studied; embeddable widgets; republishable graphics; and links to dozens of local, state and national planning documents for coping with rising seas. 

The website also shows how the threat from climate change-driven sea level rise and storm surge is expected to increase over time at 55 tidal gauges around the U.S. and near most major coastal cities. At the majority of these gauges, floods high enough to formerly be called worse than once-a-century events have more than doubled in likelihood.

Land, housing and population vulnerability estimates are based on 2010 Census data and on land elevations relative to potential water levels, and do not take into account potential protections. However, properties behind walls or levees may suffer enhanced damage when defenses are overtopped, or during rainstorms, because the same structures that normally keep waters out can keep floodwaters in once they arrive.

“Escalating floods from sea level rise will affect millions of people, and threaten countless billions of dollars of damage to buildings and infrastructure,” Strauss said. “To preserve our coastal towns, cities and treasures, the nation needs to confront greenhouse gas pollution today, while also preparing to address sea level rise that can no longer be avoided."

For more information, click here.

—————

Headquartered in Princeton, New Jersey, Climate Central is a non-profit research and journalism organization providing authoritative and up-to-date information to help the public and policymakers make sound decisions about climate and energy.

EcoWatch Daily Newsletter

Heavy industry on the lower Mississippi helps to create dead zones. AJ Wallace on Unsplash.

Cutting out coal-burning and other sources of nitrogen oxides (NOx) from heavy industry, electricity production and traffic will reduce the size of the world's dead zones along coasts where all fish life is vanishing because of a lack of oxygen.

Read More Show Less

Despite the ongoing coronavirus pandemic, which has restricted the ability to gather in peaceful assembly, a Canadian company has moved forward with construction of the controversial Keystone XL pipeline, according to the AP.

Read More Show Less
Sponsored
A gas flare from the Shell Chemical LP petroleum refinery illuminates the sky on August 21, 2019 in Norco, Louisiana. Drew Angerer / Getty Images.

Methane levels in the atmosphere experienced a dramatic rise in 2019, preliminary data released Sunday shows.

Read More Show Less
A retired West Virginia miner suffering from black lung visits a doctor for tests. Andrew Lichtenstein / Corbis via Getty Images

In some states like West Virginia, coal mines have been classified as essential services and are staying open during the COVID-19 pandemic, even though the close quarters miners work in and the known risks to respiratory health put miners in harm's way during the spread of the coronavirus.

Read More Show Less
Solar panel installations and a wind turbine at the Phu Lac wind farm in southern Vietnam's Binh Thuan province on April 23, 2019. MANAN VATSYAYANA / AFP via Getty Images

Renewable energy made up almost three quarters of all new energy capacity added in 2019, data released Monday by the International Renewable Energy Agency (IRENA) shows.

Read More Show Less