"Move Out Now"... A City of 360,000 at Risk of Disappearing Entirely

New Orleans Could Be Submerged Within This Century
Impact of Sea Level Rise Driven by Global Warming

As sea level rise caused by global warming accelerates, there are projections that New Orleans, the representative city of Louisiana, United States, could become effectively isolated or submerged by the sea within this century. Experts emphasize that responding only after damage has occurred is clearly limited, and insist that a long-term strategy, including even 'planned urban relocation,' must be prepared starting now.

New Orleans, Louisiana skyline. Pixabay

Sea Level Could Rise by Up to 7 Meters... "Already Approaching the Critical Point"

On May 27 (local time), CNN cited a study published in the international journal Nature Sustainability, reporting that sea levels along the Louisiana coast could rise by 3 to 7 meters in the future.

If this occurs, about 75% of the remaining wetlands could disappear, and the coastline could be pushed as far as 100 kilometers inland. The researchers diagnosed that the region has already come close to the 'point of no return,' warning that the city could be surrounded by the Gulf of Mexico before the end of the century.

'Natural Breakwater' Collapse... The City's Foundations Are Shaking

New Orleans is located in a basin below sea level, making it a city inherently at high risk of flooding. Furthermore, it is situated at the center of the rapidly shrinking Mississippi River Delta, and has long been considered vulnerable to sea level rise and storm surges.

Until now, the wetlands surrounding New Orleans have served as natural breakwaters, protecting the city from hurricanes and storm surges. However, expanded development, canal construction for the oil and gas industry, and the installation of levees along the river have all contributed to a significant reduction in the sediment supply needed to sustain the wetlands. In fact, it is estimated that since the 1930s, more than 5,000 square kilometers of wetlands have disappeared in Louisiana.

The researchers also presented evidence from geological records. Ancient coastlines formed about 125,000 years ago indicate that sea levels were at least 3 meters higher than today, suggesting this is a realistic scenario for future sea level rise.

Recurring Disasters and Population Outflow

The city's crisis is also evident in statistics. Following Hurricane Katrina, New Orleans' population decreased by about 25%. Since then, every time a major storm or flood occurs, a phenomenon known as 'stepwise migration' has been repeated, with large numbers of residents leaving the city.

A panorama of New Orleans, Louisiana. Getty Images Bank

The problem is that this migration does not affect all social classes equally. People with economic means can move to safer areas relatively quickly, but low-income groups are often unable to leave the city, despite falling home values, rising insurance premiums, and the weakening of public services. Experts point out that "if left without systematic public policy, only the wealthy will leave, while vulnerable populations remain, deepening 'entrenched inequality.'"

The Solution Is 'Managed Retreat'... Proactive Urban Redesign Required

'Managed retreat' is being proposed as an alternative to address this crisis. This is not about individual relocations, but refers to a long-term strategy for gradually moving urban functions and infrastructure.

The case of Kiruna in northern Sweden is often cited as a reference. The city is currently pursuing a plan to relocate the entire community to a new location following resident agreement in 2004, in order to address the problem of ground subsidence caused by mining development.

The researchers see the situation in New Orleans not as a local issue, but as a preview of the future faced by coastal cities worldwide. Torbjörn Törnqvist, a geology professor at Tulane University who led the study, said, "The choices made now will determine whether the city can survive in the decades to come," emphasizing that "a comprehensive response combining coastal restoration, sustainable development, and proactive relocation strategies is necessary."

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