Editing IPCC:AR6/WGI/Chapter-3 (section)

=== Human Influence on the Cryosphere ===

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'''It is''' very likely '''that anthropogenic forcing, mainly due to''' '''greenhouse gas increases, was the main driver of Arctic sea ice loss since the late 1970s.''' There is new evidence that increases in anthropogenic aerosols have offset part of the greenhouse gas-induced Arctic sea ice loss since the 1950s ( ''medium confidence'' ). In the Arctic, despite large differences in the mean sea ice state, loss of sea ice extent and thickness during recent decades is reproduced in all CMIP5 and CMIP6 models ( ''high confidence'' ). By contrast, global climate models do not generally capture the small observed increase in Antarctic sea ice extent during the satellite era, and there is ''low confidence'' in attributing the causes of this change. {3.4.1}

'''It is''' very likely '''that human influence contributed to the''' '''observed reductions in Northern Hemisphere spring snow cover''' '''since 1950.''' The seasonal cycle in Northern Hemisphere snow cover is better reproduced by CMIP6 than by CMIP5 models ( ''high confidence'' ). Human influence was ''very likely'' the main driver of the recent global, near-universal retreat of glaciers. It is ''very likely'' that human influence has contributed to the observed surface melting of the Greenland Ice Sheet over the past two decades, and there is ''medium confidence'' in an anthropogenic contribution to recent overall mass loss from the Greenland Ice Sheet. However, there is only ''limited evidence'' , with ''medium agreement'' , of human influence on Antarctic Ice Sheet mass balance through changes in ice discharge. {3.4.2, 3.4.3}

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