For decades, climate scientists have been tracking troubling changes in glaciers around the world. These massive bodies of ice shift and flow under their own weight, but many glaciers are now shrinking. A new trend in the European Alps suggests glacial thawing could accelerate thanks to some unassuming pink algae.
Glaciers are an important part of maintaining global temperatures because they reflect more light than other geological features — about 80 percent of solar radiation. As Earth’s ice sheets disappear, the planet absorbs more heat from the sun, contributing to higher global temperatures. And of course, higher temperatures also accelerate the melting. It turns out certain algae can make glaciers melt more quickly as well.
Sometimes called Watermellon Snow, patches of algae-infused ice and snow are common on glaciers in the spring and summer. The pink-tinted ice in the Alps has researchers from Italy’s Italy’s National Research Council concerned. Biagio Di Mauro, who has studied changes in the Morteratsch glacier in Switzerland, says the algae itself isn’t dangerous. However, its increasing presence in glaciers could worsen climate change because it makes the ice darker.