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Climate Change Glaciers and ice sheets are very vulnerable to climate warming. In a Perspective, Moon takes stock of the world's ice and asks what the future holds. With few exceptions, glaciers are retreating or even disappearing around the world, and the Greenland and West Antarctic Ice Sheets are shrinking at an accelerating rate. Studies on the ground and satellite data provide detailed insights into mass loss from the ice sheets. However, it remains difficult to determine the rate of ice loss and, thus, the likely sea level rise and effects on water resources, air and water circulation, and ecosystems. Science , this issue p. [580][1] [1]: /lookup/doi/10.1126/science.aam9625