Greenland's ice sheet does not look like an alpine glacier. However, it behaves like one in the way its meltwater lubricates basal motion, suggesting that projections of sea-level change will require unified knowledge of basal processes in glaciers and ice sheets.
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Parizek, B. Sliding to sea. Nature Geosci 3, 385–386 (2010). https://doi.org/10.1038/ngeo879
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DOI: https://doi.org/10.1038/ngeo879