If you don't have the right "Flash" or whatever - try seeing this telly clip on the BBC website http://www.bbc.co.uk/programmes/p01fsf26
The none thing I would add is the role of woods in air pollution. They scrub the air of particulates - implicated in heart disease, as well as lung disesase (by releasing stress hormones and increasing cholesterol) and also they absorb Nitrogen Oxide, which can badly effect breathing as well as be a component of acid rain (see http://urbanforestrynetwork.org/benefits/air%20quality.htm).... we need 'em
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