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Jonathan Freedland presents the programme which looks at the past behind the present. This week he takes the Long View of tree disease in Britain by charting Dutch Elm Disease from its arrival in the 1920s until the 1970s. As Ash Dieback takes root in the countryside and is treated as a national emergency, Jonathan asks what lessons can be learned from the phenomenon and ensuing crisis of Dutch Elm Disease in the 20th century when 28 million trees were lost.

Produced by Neil McCarthy.