Swiss Scientists Test Sheep’s Wool as a New Way to Protect a Melting Glacier

Scientists in Switzerland are testing an unusual material on an Alpine glacier: blankets made from sheep’s wool. The experiment aims to find a biodegradable alternative to the synthetic covers traditionally used to slow the melting of snow and ice.

The project, called “Keep It Wool,” is being carried out on the Tsanfleuron Glacier in western Switzerland by the Summit Foundation and researchers from the University of Lausanne.

Turning Unused Wool Into Glacier Protection

For years, sections of Alpine glaciers have been covered with synthetic geotextiles during the warmer months. These coverings reflect sunlight and reduce the amount of heat absorbed by the ice.

Researchers wanted to see whether sheep’s wool could perform a similar job without relying on plastic-based materials. A significant amount of wool produced in Switzerland is discarded, composted or burned because it has limited commercial value.

Two Wool Blankets Were Put to the Test

In June, researchers placed two prototype wool blankets over about 200 square metres of the Tsanfleuron Glacier. Their performance was then compared with a conventional synthetic covering throughout the summer.

Measurements taken during the experiment showed that the wool coverings limited melting at a level comparable to the synthetic material.

The Material Was More Durable Than Expected

The researchers were initially uncertain whether wool would remain stable in the harsh Alpine environment. However, the material held together better than expected after being exposed to snow, sunlight and changing weather conditions.

The results suggest that sheep’s wool could potentially become a useful biodegradable material for protecting small areas of snow and ice.

Not a Solution to Glacier Loss

Scientists involved in the project stress that wool blankets cannot stop the long-term decline of glaciers. Protective coverings are only practical for relatively small areas, and only around 0.02 percent of Switzerland’s glacier surface is currently covered.

The experiment is instead focused on finding a more environmentally friendly temporary protection method while making productive use of wool that might otherwise go to waste.

Sources

• Reuters — “Can sheep save the glaciers? Swiss scientists put wool to the test,” September 3, 2026.
• University of Lausanne — Research collaboration on the “Keep It Wool” glacier protection experiment, 2026.
• Japan Times Alpha — “Can sheep save the glaciers? Swiss scientists put wool to the test,” October 2, 2026.