The snowball Earth hypothesis posits an ice-covered planet. New climate simulations of ‘snowball’ conditions allow ice-free equatorial oceans that may be crucial for a theory about early animal evolution.
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Runnegar, B. Loophole for snowball Earth. Nature 405, 403–404 (2000). https://doi.org/10.1038/35013168
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DOI: https://doi.org/10.1038/35013168
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