EcoWatch: The U.S. currently has 59 national parks, protecting more than 210,000 square miles of land with several more public lands being preserved on state and local levels. Very few national parks are large enough to contain ecosystems. Problems such as greenhouse gases, climate change, industrial fumes, the extent of land development and their environmental impacts were not envisioned when most of their borders were first enacted. The physical boundaries of these public lands are not enough to protect...