National Park Service: Activities Within Park Borders Have Caused Damage to Resources

Pursuant to a congressional request, GAO reviewed internal threats to the national parks' resources, focusing on the: (1) National Park Service's (NPS) information on the number and types of internal threats; (2) damage these threats have caused; (3) change in the severity of these threats over the past decade; and (4) NPS actions to mitigate these threats.