Louisiana, Sinking Fast, Prepares to Empty Out Its Coastal Plain

Louisiana is finalizing a plan to move thousands of people from areas threatened by the rising Gulf of Mexico, effectively declaring uninhabitable a coastal area larger than Delaware.

A draft of the plan, the most aggressive response to climate-linked flooding in the U.S., calls for prohibitions on building new homes in high-risk areas, buyouts of homeowners who live there now and hikes in taxes on those who won’t leave. Commercial development would still be allowed, but developers would need to put up bonds to pay for those buildings’ eventual demolition.

“Not everybody is going to live where they are now ...