October 11 | Washington | Ewen MacAskill

The Guardian - The United States is working on a multi-billion-dollar plan to depopulate vast swaths of coastline along the Gulf of Mexico in a move which it is hoped would help re-establish a natural barrier against the catastrophic flooding caused by the likes of Hurricane Katrina.

In the first sign that the federal government is favouring a retreat from the coast rather than rebuilding, the Army Corps of Engineers is to present to Congress a radical plan which includes rebuilding the wetlands that have been disappearing at an ever-accelerating rate in recent years.

The Corps, the engineers responsible for protecting the coastline, has been working on the plan since Katrina struck in August 2005. President George Bush promised after the floods to rebuild New Orleans and other Gulf communities.

But federal agencies and environmentalists have concluded that climate change has increased the threat of further devastation and continued rebuilding makes no sense. To be included in the overall plan is $40bn (£20bn) to be spent on the Mississippi coast. Part of this would be for a voluntary buyout of 17,000 houses in Mississippi, particularly in Bay St Louis, east of New Orleans. The corps is likely to extend the plan to New Orleans and Louisiana.

Susan Rees, project director, said: "The whole concept of trying to remove people and properties from the coast is very, very challenging. The desire to live by the water is strong."

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See also: Climate Change and Sea Level (Other maps here).