Arctic sea-ice cover has declined precipitously in recent decades. Now research suggests that a sizeable fraction of this observed historical decline could have been caused by internal climate variability rather than by human-induced warming.
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Swart, N. Natural causes of Arctic sea-ice loss. Nature Clim Change 7, 239–241 (2017). https://doi.org/10.1038/nclimate3254
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DOI: https://doi.org/10.1038/nclimate3254
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