Disappearing glaciers, decreasing air quality and foundation species pushed to the brink of survival. America’s national parks are facing environmental threats that range from tiny invasive species to the planet-spanning impacts of climate change. In some cases, the situation is dire; in others, progress is being made. In aggregate, the issues point to how important — and how fragile — these special places are.
“Each unit in the system has its own unique challenges,” said Al Nash, spokesman for Yellowstone National Park, “but they all reflect a component of who we are and where we’re going. They’re about our shared experience as Americans.”