the "Leave no trace" concept is an impossible one. But, I do believe that minimal impact is something everyone who enjoys nature needs to take into consideration. For example, if the trail say "do not stray from trail" then don't, plain and simple. There are people out there who are much more knowledgable in what impact and to what extent are caused by our actions in "prisitine" places who are giving the government these suggestion. Scientists have dedicated their lives to such things, we should take them seriously. IMO.
I am of the belief that if you don't need to alter or impact anything then don't. You don't need to leave anything behind, pack it out. You don't need to take anything with you accept what you brought.
Hopefully most people believe in minimal impact in order for these "wild" places to maintain for much longer after we are gone.
Steve Zissou: Anne-Marie, do all the interns get Glocks?
Anne-Marie Sakowitz: No, they all share one.
"An eye for an eye makes the whole world blind"~Gandhi