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On Greenland, tens of thousands of years of snowfall have settled and solidified into a massive sheet of ice. Each summer, snow retreats briefly at low elevations, and a narrow strip of rocky coastline emerges. As it thins and fractures, sea ice that packed into the mouths of fjords over the winter takes on the look of a mosaic made from blue and white stained glass. Glaciers flowing down from the highland interior get a little slushy, at least on top; turquoise blue pools of melt water dot the surface. These seasonal changes are apparent in this image of the Petermann Glacier in far northwestern Greenland. The image was captured by the Moderate Resolution Imaging Spectroradiometer (MODIS) on NASA's Terra satellite on July 5, 2003. While some seasonal thawing is typical on Greenland, more dramatic changes are probably in store for the Greenland Ice Sheet in coming decades and centuries. Few places on Earth are warming faster than the Arctic, and scientists have observed widespread thin...