Ancient Canadian ice survived previous warm periods.
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References
Froese, D. G., Westgate, J. A., Reyes, A. V., Enkin, R. J. & Preece, S. J. Science 321, 1648 (2008).
Schuur, E. A. G. et al. Bioscience 58, 701–714 (2008).
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Hoag, H. Permafrost that lives up to its name. Nature (2008). https://doi.org/10.1038/news.2008.1119
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DOI: https://doi.org/10.1038/news.2008.1119