A coupled model of palaeoclimate and carbon cycling turns up the heat on the idea that Earth once became a giant snowball. It supports instead a milder 'slushball Earth' history — but piquant questions remain.
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Kaufman, A. Slush find. Nature 450, 807–808 (2007). https://doi.org/10.1038/450807a
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DOI: https://doi.org/10.1038/450807a