http://www.kqed.org/.stream/anon/radio/quest/2010/05/2010-05-31-quest.mp3
Many Californians will be spending summer traveling to their favorite getaway spot. Some of the most popular tourist destinations are national parks. But we can love them just a little too much. Too many hikers crowd trails, exhaust from automobiles clouds park air, and as Craig Miller reports, we can also have a big impact on one of the most treasured aspects of a park, its sound.