[Closed] A question about mtb trail erosion?

Just seen [url=

report on BBC NI about an event in Belfast today.

Now other than the biased anti mtb nature of the report it got me thinking. 2 individuals were interviewed with contrasting views on the damage mountainbiking does to the landscape. Both of which fairly obviously had 2 entirely contrasting opinions on it. Anyway I'm just wondering does anyone know of an independent study that's been conducted anywhere, though really specifically in the British Isles, on trail erosion? And I guess more so one that contrasts erosion caused by different types of trail users?

Obviously I'm not anti mtb, as well I'm a keen mountainbiker, though it would be interesting to find out if there's any legitimate information anywhere that actually tells what the real story is. So should something like this come up again it would be easier to just say you know what that's not actually true, here's the real truth.