Trees affected by ash dieback
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Ash dieback: How the British landscape is changing

12 June 2013 Last updated at 06:57 BST

The Forestry Commission is warning that a whole generation of ash trees is likely to die because of the unstoppable spread of the ash dieback disease.

It has been a year since it was first discovered in the UK and now the trees are in leaf, the full impact of the disease is starting to become evident.

Jeremy Cooke reports.