Internal climate variability can mask or enhance human-induced sea-ice loss on timescales ranging from years to decades. It must be properly accounted for when considering observations, understanding projections and evaluating models.
Links:
[1] http://admin.indiaenvironmentportal.org.in/feature-article/influence-internal-variability-arctic-sea-ice-trends
[2] http://admin.indiaenvironmentportal.org.in/category/author/neil-c-swart
[3] http://admin.indiaenvironmentportal.org.in/category/author/john-c-fyfe
[4] http://admin.indiaenvironmentportal.org.in/category/author/ed-hawkins-et-al
[5] http://admin.indiaenvironmentportal.org.in/category/journal/nature-climate-change
[6] http://admin.indiaenvironmentportal.org.in/category/thesaurus/arctic
[7] http://admin.indiaenvironmentportal.org.in/category/thesaurus/climate-change
[8] http://admin.indiaenvironmentportal.org.in/category/thesaurus/climate-science
[9] http://admin.indiaenvironmentportal.org.in/category/thesaurus/global-warming