During the last ice age, huge numbers of icebergs were episodically discharged from an ice sheet that covered North America. Numerical modelling suggests that these events resulted from a conceptually simple feedback cycle. See Letter p.332
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Vieli, A. Pulsating ice sheet. Nature 542, 298–299 (2017). https://doi.org/10.1038/542298a
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DOI: https://doi.org/10.1038/542298a