The U.S. coastline is expected to experience as much sea level rise in the next 30 years as it did in the hundred years prior
Los Angeles and other coastal areas of the United States will experience frequent flooding, degraded infrastructure and other profound challenges as sea levels rise by as much as 1 foot by 2050, a federal study released Tuesday found.outlines an alarming new future for communities, ecosystems and economies along the nation’s seaboard, and predicts that the U.S. coastline will experience as much sea level rise in the next 30 years as it did in the last hundred years.
“One of the first ways we’ll feel that 10 inches is through high tide, or nuisance, flooding,” Hamlington said, noting that West Coast communities that already occasionally see flooding during king tides will soon be subject to a new kind of “flooding regime,” where even small tides will send ocean water ashore.
Though the drought and rising seas are not directly connected, “they’re both consequences and negative impacts that we expect to see with global warming,” he said. Tens of millions of people in the United States and hundreds of millions of people globally live in areas that are at risk of coastal flooding.
The rising seas also pose a critical risk to infrastructure such as roads, water supplies, power plants, oil and gas wells and sewage treatment systems, and nearly “everything that we use, eat and wear” that comes through the supply chain and arrives through coastal ports, LeBoeuf said during the news conference.
“There’s definitely a lot of low-lying communities that have seasonal or annual high tide flooding today,” Barnard said. Venice, Seal Beach, Newport and parts of Huntington Beach are all examples. “They’re already sort of on that knife-edge, and another foot of sea level rise is going to increase the frequency of flooding of those communities.”
The response to rising sea levels increasingly involves adaptation and mitigation in addition to prevention. Sea levels will continue to rise in the coming decades and centuries even if global emissions and temperatures are reduced, the latest report says. That’s largely because of the ocean’s sustained response to the warming that has already occurred.
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