In reply to jonnie3430: Ok then, so assuming your serious. I work at an outdoor centre, each week we have groups of kids in, and one of the most important thing we teach is caring for the environment. This usually includes all kinds of things. But lets assume we did a little nature walk and a Roaches trip.
At the Roaches: "Ok kids this is the Roaches, it's very important, climbing history, need to look after it, blah blah, oh and don't dry tool here ever!"
On the nature walk: "Ok kids this is an Oak tree, don't worry about looking after it though, infact I brought these ice axes, just go ahead and whack them into the trees, it doesn't matter"
Do you see the pointlessness of what you are saying, damage to the environment is not acceptable ever, besides the obvious damage to the trees with crampons and axes, you propose slinging a top rope over? Do you not think the abrasion from a rope would erode the tree branches over time if people were top roping trees all the time. Tree's are as much a part of the environment as crags, hills, anything.