Analyses of a new ice core from Greenland yield the first high-resolution picture of the start of the last ice age in the Northern Hemisphere, and of the onset of climate instability as our planet cooled.
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Cuffey, K. Into an ice age. Nature 431, 133–134 (2004). https://doi.org/10.1038/431133a
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DOI: https://doi.org/10.1038/431133a
