Glaciers in Europe's Alps Mountains are becoming more unstable and dangerous because of rising temperatures linked to climate change. A glacier is a large body of ice that slowly moves down a mountain or over a wide area of land. The warming of the earth’s atmosphere is reawakening what were considered inactive ice masses. Italy has experienced early and severe summer heat. Many people are concerned about the effects of a severe lack of rain on crops in the Po Valley. In the Dolomite Mountains, a glacier recently collapsed on the Marmolada peak. At least seven people died. Many others are missing.