Wednesday, October 01, 2003 - Humans can affect wildlife habitat and ecosystems just by traveling through them. Usually, though, the damage done by hikers, horseback riders and mountain bikers is minimal, or at least repairable. The good news is that most of the 214 million people who visit our national forests every year are proper stewards of their public lands, leaving behind footprints that disappear and taking with them only memories that last a lifetime.