Analyses of boron isotopes in ancient marine carbonate sediments provide an enlightening perspective on the links between carbon dioxide and ice-cap cover at a climatically momentous time in Earth's history.
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Lemarchand, D. Early survival of Antarctic ice. Nature 461, 1065–1066 (2009). https://doi.org/10.1038/4611065a
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DOI: https://doi.org/10.1038/4611065a