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4. San Francisco's "managed retreat" from rising sea levels
The city of San Francisco has imminent plans to shut down nearly 1 mile of its heavily trafficked roadway bordering the Pacific Ocean, due to erosion concerns from rising sea levels.
Why it matters: The proposal, known officially as the Ocean Beach Climate Change Adaptation Project, is the city's first known example of a "managed retreat" and shows how sea level rise is already changing the way San Francisco functions.