Editing IPCC:AR6/WGI/Chapter-9 (section)

=== Permafrost ===

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'''Increases in permafrost temperature have been observed over the past three to four decades throughout the permafrost regions''' ( ''high confidence'' '''), and further global warming will lead to near-surface permafrost volume loss''' ( ''high confidence'' ''').''' Complete permafrost thaw in recent decades is a common phenomenon in discontinuous and sporadic permafrost regions ( ''medium confidence'' ). Permafrost warmed globally by 0.29 [0.17 to 0.41, ''likely'' range] °C between 2007 and 2016 ( ''medium confidence'' ). An increase in the active layer thickness is a pan-Arctic phenomenon ( ''medium confidence'' ), subject to strong heterogeneity in surface conditions. The volume of perennially frozen soil within the upper 3 m of the ground will decrease by about 25% per 1°C of global surface air temperature change (up to 4°C above pre-industrial temperature) ( ''medium confidence'' ). {9.5.2}

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