Mr Simon believed that increased tree planting, entrepreneurial activity and cheaper substitutes would result in a decline in its value.

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Their home, once teeming with activity, sits quietly on a tree-lined street.

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Facebook apps transform Facebook into a hub for all kinds of activity, from playing games to setting up a family tree.

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For about a century now, tree planting has been the mass-participation activity.

BBC: NEWS | Science/Nature | Rolling back Iceland's big desert