Swiss Glaciers Thaw at Alarming Rate, Losing 5.5% of Ice Volume in 2026

Glaciers in Switzerland, which hold the most ice in the Alps, lost 5.5% of their volume in 2026, marking the second-largest percentage decrease on record. Experts attribute this accelerated thaw to heat waves and a lack of winter snowfall.

The GLAMOS Swiss glacier monitoring service and the Swiss Academy of Sciences stated that Alpine glaciers are unlikely to survive under current conditions. The trend has intensified in recent years, with nearly a fifth of Switzerland's glacier ice volume disappearing in the past five years alone.

Matthias Huss, head of GLAMOS and a glaciology professor, emphasized that the current warming is entirely due to human-caused climate change driven by fossil fuel emissions. "It's as simple as that," he said.

The record retreat of glacier ice in Switzerland previously occurred in 2022, exacerbated by summer heat, minimal winter snow, and dust from the Sahara that darkened the ice, increasing heat absorption. Huss explained that winter snow cover is crucial for two reasons: it protects existing ice from melting and provides material for glaciers to form new ice at high elevations.

The rapid melting in Switzerland is part of a broader trend affecting mountain ranges globally. Experts note that global warming also contributed to a Himalayan slope collapse in August, which led to catastrophic flooding in Nepal. Satellite data has revealed significant ice loss in regions like Greenland and Antarctica over the last half-century.

While the absolute volume of ice lost in Switzerland this year is less than in 2003, the percentage decline is greater. This is because the total ice volume has already decreased significantly since then, with current volumes roughly one-third of what they were 23 years ago. In 2003, the relative loss was 3.5% of the total ice volume.

The melt of 2.2 trillion liters (581 billion gallons) of water from July to September has had tangible impacts in Switzerland, equivalent to four times the country's annual water consumption. This is particularly concerning as Switzerland relies on hydropower for more than half of its electricity.

Furthermore, Switzerland serves as the "water tower of Europe," feeding major rivers such as the Danube, Po, Rhine, and Rhone. The accelerated glacier melt thus has far-reaching consequences for water availability across the continent.

Experts observed that the "extreme melting" this year resulted in an average thickness reduction of 2.5 to 4 meters (about 8-13 feet) across individual glaciers, with some experiencing a reduction of up to 10 meters (33 feet) at their tongues.

Field teams are assessing runoff and ice formations by tracking water flows, including by adding dye to glacial streams. The Allalin, Clariden, Rhone, and Aletsch glaciers, the latter being the largest in the Alps, all recorded their most significant melt on record this year.