National Parks Grapple with Accelerating Climate Change: A Shifting Landscape
America’s national parks were initially envisioned as protected spaces, untouched by the transformations occurring across the rest of the continent. However, the escalating impacts of climate change are now challenging this foundational premise. A recent comprehensive assessment of park vulnerability indicates that many of these landscapes are undergoing profound ecological shifts, potentially diverging significantly from their original character.
The study, published in Conservation Letters, evaluates 259 national park units across the contiguous United States using a framework commonly employed in climate science: exposure, sensitivity, and adaptive capacity. Exposure measures the extent of climatic changes, sensitivity reflects the degree to which ecosystems respond to these changes, and adaptive capacity assesses the ability of landscapes and species to adjust. Taken together, these dimensions reveal not only the magnitude of change parks will experience but also their likelihood of undergoing fundamental transformation.
The findings reveal widespread vulnerability. Two-thirds of the surveyed parks were identified as highly exposed to at least one potentially transformative threat, including wildfires, drought, forest pests, and sea-level rise. In total, 77% were ranked as highly vulnerable either overall or to a specific high-impact hazard. This does not necessarily imply imminent catastrophe for all parks, but rather that few can expect to remain static.
Geographic location plays a significant role in determining vulnerability. Parks in the Midwest and eastern United States generally exhibit the highest cumulative vulnerability. These landscapes are often situated within heavily modified surroundings, characterized by fragmented habitats, high levels of air pollution, pressure from invasive species, and limited topographic variation. These conditions reduce the capacity of species to adapt to shifting climates, as they may face obstacles in migrating across developed areas.
In contrast, western parks often appear less vulnerable in aggregate analyses. Their rugged terrain can create microclimates that provide refugia, and elevation gradients allow species to move upslope. Furthermore, lower surrounding human population densities offer some buffering effect. However, this apparent resilience is often misleading. Many western parks are simultaneously exposed to multiple transformative disturbances, particularly wildfires, prolonged droughts, and insect outbreaks.
The interplay of these disturbances is particularly concerning. Severe drought can weaken forests, making them more susceptible to bark beetles. Beetle-killed trees increase fuel loads, leading to hotter and more extensive wildfires. Post-fire recovery can also fail, resulting in permanent ecological reorganization, such as the conversion of forests to shrubland or grassland.
Coastal parks face a distinct set of challenges. Rising sea levels and storm surges threaten salt marshes, mangroves, and coastal forests, while inland development restricts their ability to migrate. The study identifies dozens of parks along the Atlantic and Gulf coasts at risk of significant inundation. Once submerged, these ecosystems cannot be easily restored to their previous conditions.
The study highlights a pattern of uneven vulnerability. Some parks face gradual degradation, while others experience abrupt and dramatic changes. The greatest risk is not necessarily associated with the fastest warming rates, but rather with a combination of high exposure and low adaptive capacity. Flat terrain, intensive surrounding land use, and existing ecological stressors can amplify the consequences of even moderate climate shifts.
The National Park Service is beginning to adapt its management philosophy to this evolving reality, adopting a framework of “resist, accept, direct.” This involves attempting to maintain historical conditions in some cases, allowing change to proceed in others, and actively guiding ecosystems toward new states that may preserve key functions or species. This approach acknowledges that preserving parks as static representations of the past is no longer feasible.
However, recent policy developments pose significant challenges to effective climate adaptation. Federal actions that weaken climate mitigation efforts, such as the rescission of the Environmental Protection Agency’s endangerment finding, reduce the likelihood that the underlying drivers of change will be addressed at a national level. Simultaneously, proposals to expand resource extraction on nearby public lands and to reopen protected marine areas to commercial fishing increase external pressures on park ecosystems. Staffing reductions and funding constraints across the park system further limit the capacity to monitor and respond to emerging threats.
The result is a growing disparity between the scale of ecological change and the institutional capacity to manage it. Climate impacts accumulate over time, eventually becoming irreversible. A prolonged drought becomes a megadrought, and a large fire season becomes the norm. Because national parks are embedded within broader landscapes, many drivers of change originate outside their boundaries, beyond the direct control of park managers.
Despite these challenges, national parks may become even more valuable as refuges for biodiversity and as benchmarks for documenting environmental change. Their role will likely shift from preserving fixed snapshots of nature to functioning as laboratories of adaptation, showcasing how ecosystems reorganize under pressure.
The study’s most sobering insight is that vulnerability is not evenly distributed. While some of the most iconic parks in the American West possess sufficient ecological diversity to buffer change, many lesser-known parks in the East and Midwest do not. Their landscapes are flatter, more fragmented, and more exposed to pollution and invasive species, leading to amplified ecological effects from climate change.
The national park system, designed around the concept of permanence, is facing a fundamental challenge. Climate change is eroding this premise. The future of these protected areas will depend less on legal protections than on geographic factors, surrounding land use, and the rate of global warming itself.
In the coming decades, visitors may still encounter familiar scenery – forests, wetlands, deserts, and mountains. However, the rapid pace of environmental change may be increasingly difficult to perceive. National parks, once imagined as places outside of time, are increasingly becoming places where time is accelerating.
