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With 80 million Ash trees in the country under threat, can anything be done to save them from the devastating effects of Ash dieback? Dr. Adam Hart looks at what scientists know about the fungus that causes Ash dieback, he travels to Poland - where the fungus was first isolated and identified and speaks to leading scientists not only there but in the UK and Denmark to determine if Ash trees will suffer the same fate as they have across the continent.
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