Earlier spring could spell trouble for permafrost.
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References
Derksen, C. & Brown, R. Geophys. Res. Lett. http://www.agu.org/pubs/crossref/2012/2012GL053387.shtml (2012).
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Hoag, H. Arctic snow cover shows sharp decline. Nature (2012). https://doi.org/10.1038/nature.2012.11709
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DOI: https://doi.org/10.1038/nature.2012.11709