Researchers in Switzerland are warning that climate change could be altering the Alpine landscape. The Swiss-led team looked at 335 studies and evaluated almost a third of them. Their findings, published on Thursday in the journal Earth-Science Reviews, show a mixed picture. The experts examined rockfalls, landslides, debris flows, and ice and snow avalanches. They were only able to draw one clear conclusion: Rockfalls have increased at high altitudes in the Alps. The reasons for this include retreating glaciers and thawing high-altitude permafrost. Moisture in the soil can loosen stones and b…