We rode gravel roads, so there's no damage left behind
I do know what your talking about though, anytime your on dirt, or single track, dirt bikes will leave a path of destruction, and it's a 4 stroke, cleaner burning than most cars, 2 strokes are the ones that make fumes
I think the future of the sport is "dualsport" ie street legal dirtbikes, with semi pavement tires, on forest service roads, it's only a matter of time before all the true offroad trails are closed.
I just wish the kids could enjoy it with me, they are stuck in the jeep