Sea levels are rapidly increasing, probably at the fastest rate in 28 centuries. Of the projected population at risk, nearly 50% will be in Florida, and an additional 20% in other parts of the southeastern U.S. In 30 different counties, more than 100,000 people would be at risk. None of the 22 coastal states in the continental U.S., as well as Washington, D.C., will be immune from the effects. The cost of relocating the 13.1 million people displaced by sea-level rise could be about $14 trillion.
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