Temperature estimates derived from isotopes in polar ice cores reveal much about Earth's past climate. According to the latest analysis, interglacial periods were rather warmer than previously thought.
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Noone, D. Kink in the thermometer. Nature 462, 295–296 (2009). https://doi.org/10.1038/462295a
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DOI: https://doi.org/10.1038/462295a
