Earth’s permafrost is thawing across the Arctic, Antarctica, and high mountain regions, according to a global study that brings together more than two decades of observations from 156 monitoring sites. The research found measurable changes in frozen ground across continents, with mountain areas showing some of the fastest rates of degradation. The shift matters well beyond climate science: thawing permafrost can destabilize roads, buildings and other infrastructure while exposing carbon stored in frozen soils to the atmosphere.

Led by researchers at George Washington University, the study represents the first global assessment built from long-term permafrost monitoring data across these major cold regions. Rather than focusing on isolated areas where thaw has already been documented, researchers compared observations from different climate zones to identify broader patterns.

Mountain Regions Show Some of the Fastest Change

The results reveal a widespread increase in the thickness of the active layer, the upper section of ground that freezes and thaws seasonally above permanently frozen soil.

• In the Arctic, active layer thickness increased significantly at 55% of monitoring sites, while the figure reached 38% in Antarctica.

The changes were even more pronounced in mountain environments.

• More than 90% of monitored sites across Europe and high-elevation Asia recorded measurable thickening.
• Monitoring locations in South America showed similar trends, while some high-altitude sites experienced an active layer that was roughly twice as thick as before.

Dmitry Streletskiy, the study’s lead author and a professor at GW, said permafrost is a particularly important climate indicator because frozen ground responds directly to rising temperatures. The long-term observations, he said, show that degradation is no longer limited to a handful of well-known hotspots.

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Warming and Rainfall Are Both Playing a Role

Temperature increases emerged as the dominant driver of active-layer thickening across the Arctic. However, researchers also identified changing rainfall as an important influence.

Warmer air can thaw frozen ground from above, while rain can transfer additional heat into the soil. When these processes occur together, they can accelerate seasonal thaw and alter the stability of permafrost landscapes.

The implications are potentially significant for northern communities. Earlier research led by Streletskiy estimated that as much as 50% of Arctic infrastructure could face a high risk of damage by 2050 as frozen ground deteriorates. Roads, buildings, pipelines and other structures depend on the stability of the ground beneath them.

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Monitoring Gaps Remain Outside the Arctic

The Arctic has the strongest long-term monitoring network, supported in part by the Circumpolar Active Layer Monitoring programme established in the 1990s. Antarctica and high mountain regions have considerably less extensive observation coverage.

Researchers say expanding monitoring in these areas is essential for understanding why some locations are thawing faster than others. Better observations could also improve estimates of future infrastructure risks and the amount of carbon potentially released as frozen soils warm.

The study, published in Communications Earth & Environment, adds to growing evidence that Earth’s permafrost thawing is a broad global process rather than a collection of isolated events. As warming continues, the researchers argue that tracking these changes will be increasingly important for understanding both regional hazards and the wider climate consequences of a rapidly changing frozen landscape.

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