Glacial intervals are characterized by low levels of atmospheric CO2. A new explanation for that connection invokes nutrient export from the Southern Ocean to warmer waters at such times.
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Ganeshram, R. Oceanic action at a distance. Nature 419, 123–124 (2002). https://doi.org/10.1038/419123a
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DOI: https://doi.org/10.1038/419123a