Glaciers and snow in high mountains in North America:
Almost 90% of the approximately 105,000 km² glacier area (without the Canadian Arctis) in the high mountains of the North American continent is in Alaska. Due to their large ice masses, the Alaska glaciers are of global importance for their possible contribution to the sea level rise of approx. 5.5 cm. The sharp rise in temperature is already causing a significant decline in glaciers. In the high mountains in western Canada, the glaciers primarily play a role as melt water suppliers for the surrounding regions. They too are showing significant losses due to climate change, especially in the inland Rocky Mountains. The glaciers in the contiguous U.S. territory account for less than 1% of the total area of high mountain glaciers in North America. Despite their small size, however, they are of considerable importance for the hydrology of the respective region. The sharp rise in temperature and, in some cases, decreasing rainfall have already caused the glacier surfaces, but also the snow cover, to melt together significantly and will cause numerous glaciers to disappear by 2100 – with considerable effects on water supply, especially in California.