Sliding of the Greenland ice sheet is affected by the production of surface meltwater. A new theory shows that whether the result is a long-term speed-up or slow-down of ice motion depends on the variability in melt input. See Letter p.803
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J. GULLY
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Lüthi, M. Greenland's glacial basics. Nature 468, 776–777 (2010). https://doi.org/10.1038/468776a
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DOI: https://doi.org/10.1038/468776a
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