New monitoring data released by Glacier Monitoring Switzerland show that Swiss glaciers have shed more than five percent of their remaining ice over the last twelve months – a rate that scientists describe as "extraordinary" and far above the historic benchmark of 2% loss in a single year.
What the data show
According to the report, an estimated 5.5% of glacier ice disappeared in 2026, driven by intense summer heatwaves that melted snow cover early in the season. The Morteratsch Glacier, among others, was photographed with its front exposed to warm air and water, illustrating the rapid retreat.
Implications for water resources
Glacier meltwater is a critical buffer for Switzerland’s water‑dependent sectors. Scientists estimate that the glaciers released 2.2 trillion litres of meltwater between July and September, temporarily easing water shortages for irrigation, hydropower and even shipping on the Rhine. However, Dr Matthias Huss warned that this “old water” is a finite reserve: "Every drop of water that runs off during these heatwaves is kind of old water that's been stocked in the glacier ice centuries or decades ago. It's helping us [now] but it's unsustainable, so we won't have it at [our] disposal in the next heatwave."
- Agriculture: reduced melt threatens irrigation during dry spells.
- Hydropower: lower glacier input could limit electricity generation.
- Transport: the Rhine’s record lows have already impacted shipping routes and raised costs.
Risks beyond water
The rapid thinning also destabilises mountain slopes, increasing the likelihood of landslides and flash floods. The report cites the August 2023 Nepal disaster, where a collapse of bedrock and glacier ice triggered a deadly flood, as a cautionary example of how long‑term glacier loss can amplify such hazards.
What scientists say
"It's really just disastrous," said Dr Matthias Huss, director of Glacier Monitoring Switzerland. Dr Fabien Maussion, a glaciologist at the University of Bristol, added that the speed of loss was "extremely distressing… but at the same time it was to be expected from a climate scientist's perspective." Both emphasize that while the current melt is alarming, sharp cuts to carbon emissions could still preserve much of the world’s remaining glacier ice, especially in the Himalayas and polar regions.
Future outlook
If current trends continue, smaller glaciers will be unable to replenish water stores, leading to chronic shortages during future heatwaves. The researchers stress that protecting the climate remains the most effective lever for slowing glacier retreat and safeguarding downstream communities.