Trees For Life is a Scottish charity that has pledged to preserve - and restore - the Caledonian forest in the Highlands.
At one time, the forest covered 1.5 million hectares; now only one per cent of that area remains. Muriel Gray, Trees For Life patron, is pictured planting the charity's half millionth tree.
The charity has joined the Billion Trees Campaign and has pledged to plant 100,000 trees in 2007. Go here to lend a hand.
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