Empty mobile home lot A mobile home sits on a vacant lot where mobile homes used to stand before Hurricane Irma in Marathon, Florida, on Tuesday, April 17, 2018. Around the country, the government's response to extreme weather is pushing lower-income people away from the waterfront, often in the name of safety. Those homes, in turn, are often replaced with more costly houses, such as those built higher off the ground and are better able to withstand storms. (Photo: Alicia Vera/Bloomberg)

Global warming may push millions of Americans away from the coast, and the U.S. isn't prepared for the consequences of such a mass migration, scientists from across the federal government warned on Friday.

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