The organic matter stored in frozen Arctic soils could release significant quantities of carbon dioxide and methane on thawing. Now, laboratory experiments show that re-wetting of previously thawed permafrost could increase nitrous oxide production by 20-fold.
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Jungkunst, H. Arctic thaw. Nature Geosci 3, 306–307 (2010). https://doi.org/10.1038/ngeo851
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DOI: https://doi.org/10.1038/ngeo851