Remnants of the Laurentide ice sheet lasted until about 7,000 years ago. Climate simulations show that they caused the multimillennial delay between maximum early Holocene solar radiation and temperatures evident in Northern Hemisphere proxy records.
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Widmann, M. Delayed Holocene warming. Nature Geosci 2, 380–381 (2009). https://doi.org/10.1038/ngeo536
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DOI: https://doi.org/10.1038/ngeo536
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