Can sheep's wool blankets stop Swiss glaciers from melting?

Sheep's wool covers can slow melting directly beneath them, but saying they can stop Swiss glaciers from melting overstates what the experiment found.

The Keep It Wool project tested two 10-by-10-metre wool covers beside a conventional synthetic cover. Initial observations found comparable local protection, although the project says the collected data still needs analysis.

Protective covers currently reach only about 0.02% of Switzerland's glacier area. The project itself says that even large-scale covering would not halt glacier loss and that reducing greenhouse gas emissions remains the main long-term response.