America’s national parks were conceived as refuges from the forces reshaping the continent. Climate change is breaching that boundary. A study in Conservation Letters suggests many parks are not merely warming but being pushed toward ecological states unlike those they were created to preserve.
Researchers assessed 259 park units across the contiguous United States using three measures: exposure to climatic change, ecosystem sensitivity, and adaptive capacity—the ability to adjust. Together these indicate not just how much conditions will shift, but how likely transformation is. Two-thirds of parks are highly exposed to at least one major threat such as wildfire, drought, pests, or sea-level rise. Overall, 77% rank as highly vulnerable either system-wide or to a specific hazard. Stability may become the exception.
Geography shapes risk. Parks in the Midwest and East show the highest cumulative vulnerability. They are often islands within heavily altered landscapes marked by fragmentation, pollution, invasive species, and limited topographic relief. Species tracking shifting climates must cross farmland, suburbs, or highways—barriers largely absent when the parks were established. Western parks often appear less vulnerable because rugged terrain creates microclimates and elevation gradients that offer refuges. Yet many face simultaneous disturbances, especially severe fire, prolonged drought, and insect outbreaks.
These disturbances reinforce one another. Drought weakens trees, beetles proliferate, dead wood accumulates, and fires burn hotter and wider. Recovery can fail, converting forests to shrubland or grassland—an ecological reorganization rather than temporary damage. Coastal parks face rising seas and storm surge, while development inland blocks ecosystem migration. Once submerged, these systems cannot simply be restored.
Managers increasingly accept that preserving historical conditions may be impossible. The National Park Service now uses a “resist, accept, direct” framework: maintain past states where feasible, allow change where unavoidable, or guide ecosystems toward new configurations that retain key functions. Funding constraints and external pressures further limit response capacity.
Many drivers originate outside park boundaries, beyond managerial control. Yet parks may become more important—as refuges for biodiversity and as benchmarks of environmental change. Their role is shifting from preserving static snapshots to documenting adaptation in real time.
The system was built on the assumption of permanence. Visitors may still see familiar landscapes, but the processes shaping them are accelerating. Parks once imagined as places outside history are becoming places where history is unfolding faster than expected.
👉 Full-length piece: America’s national parks face an uncertain future as climate risks mount
