Britain's biggest butterfly threatened by rising seas

New charity warns Britain's largest butterfly could be lost within four decades as rising seas turn its habitat into saltmarsh

Britain's biggest butterfly, the swallowtail, could become extinct within four decades because of rising sea levels, a new charity has warned.

New inland habitat needs to be created for the swallowtail because rising seas are predicted to turn much of its current home, the Norfolk Broads, into saltmarshes later this century.