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Search teams combed the barren marshland on foot near to where he was found while a helicopter and drones searched for any clues on how and why he got there.

Its marshlands store large amounts of carbon, helping to mitigate climate change.

Focusing instead on strengthening levees in the Delta and restoring tidal marshlands, he said, would ensure that water is “delivered to the doorstep of your existing pumps reliably.”

Proposals to breach the banks to create the new marshland have gone down very badly.

The western Spanish region of Extremadura, which also has substantial marshlands, has seen 17 cases.