From an article in New Scientist:

Each spring, residents of nearby villages drape huge blankets over the Rhône glacier in the Swiss Alps. The glacier, which is the primary source of the Rhône river, has lost 40 per cent of its volume in the past century. By shielding the ice from ultraviolet radiation, the blankets reduce melting by around 50 per cent, but they can’t stop the glacier’s retreat.

https://www.newscientist.com/article/2397804-prize-winning-photos-highlight-the-impact-of-climate-change-on-nature/