Flooding is driving millions of people to move out of their homes, limiting growth in some prospering communities and accelerating the decline of others, according to a new study that details how climate change and flooding are transforming where Americans live.

In the first two decades of the 21st century, the threat of flooding convinced more than 7 million people to avoid risky areas or abandon places that were risky, according to a paper Monday in the journal Nature Communications and research by the risk analysis organization First Street Foundation.

Climate change is making bad hurricanes more intense and in

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