overuse, insufficient funds for park operation, threats to wildlife, the concession systems, energy and mineral development, atmospheric pollution, and activities on adjacent lands
Mosquitos can be bothersome in summer. Bark beetles attack old forests.
It is a place of natural beauty and of archaeological significance. www.nps.gov/zion
National parks are established by the governing bodies of whatever country they happen to be in. In the U.S. that would be the U.S. Congress.