Widespread loss of safe lake ice access in response to a warming climate

52. Benson BJ, Magnuson JJ, Jensen OP, Card VM, Hodgkins G, Korhonen J, et al. Extreme events, trends, and variability in Northern Hemisphere lake-ice phenology (1855–2005). Climatic Change. 2012; 112: 299–323. https://doi.org/10.1007/s10584-011-0212-8 53. Knoll LB, Sharma S, Denfeld BA, Flaim G, Hori Y, Magnuson JJ, et al. Consequences of lake and river ice loss on cultural ecosystem services. Limnology and Oceanography Letters. 2019; 4: 119–131. https://doi.org/10.1002/lol2.10116 54. Stammerjohn S, Massom R, Rind D, Martinson D. Regions of rapid sea ice change: An inter-hemi- spheric seasonal comparison. Geophysical Research Letters. 2012;39. https://doi.org/10.1029/ 2012GL050874 55. Bergman JN, Beaudoin C, Mistry I, Turcotte A, Vis C, Minelga V, et al. Historical, contemporary, and future perspectives on a coupled social–ecological system in a changing world: Canada’s historic Rideau Canal. Environ Rev. 2022; 30: 72–87. https://doi.org/10.1139/er-2021-0026 56. White-Crummey A. Watery canal, balmy forecast worry Winterlude fans. CBC News. 3 Jan 2024. Avail- able: https://www.cbc.ca/news/canada/ottawa/winterlude-2024-weather-forecast-ottawa-rideau-canal- 1.7072862. Accessed 4 Apr 2024. 57. Brammer JR, Samson J, Humphries MM. Declining availability of outdoor skating in Canada. Nature Clim Change. 2015; 5: 2–4. https://doi.org/10.1038/nclimate2465 58. Agrawal N, Jahanandish A. Is climate change impacting Rideau Canal Skateway, the world’s longest skating rink? Nat Hazards. 2019; 98: 91–101. https://doi.org/10.1007/s11069-018-3459-9

59. Robertson C, McLeman R, Lawrence H. Winters too warm to skate? Citizen-science reported variability in availability of outdoor skating in Canada. Canadian Geographies / Ge´ographies canadiennes. 2015; 59: 383–390. https://doi.org/10.1111/cag.12225 60. Ford JD, Clark D, Pearce T, Berrang-Ford L, Copland L, Dawson J, et al. Changing access to ice, land and water in Arctic communities. Nat Clim Chang. 2019; 9: 335–339. https://doi.org/10.1038/s41558- 019-0435-7 61. Dingle H. Migration: The Biology of Life on the Move. 2nd ed. Oxford University Press; 2014. 62. Contini N, Giles AR, Giesbrecht G, Raddi T. The adaptation of the beyond cold water bootcamp course for Inuvialuit communities in Northwest Territories, Canada. International Journal of Circumpolar Health. 2021; 80: 1969744. https://doi.org/10.1080/22423982.2021.1969744 PMID: 34433380 63. Bra´zdil R, Chroma´ K, Dola´ k L, Rˇ ehoř J, Rˇ eznı´čkova´ L, Zahradnı´ček P, et al. Fatalities associated with the severe weather conditions in the Czech Republic, 2000–2019. Natural Hazards and Earth System Sciences. 2021; 21: 1355–1382. https://doi.org/10.5194/nhess-21-1355-2021 64. Ga¨deke A, Langer M, Boike J, Burke EJ, Chang J, Head M, et al. Climate change reduces winter over- land travel across the Pan-Arctic even under low-end global warming scenarios. Environ Res Lett. 2021; 16: 024049. https://doi.org/10.1088/1748-9326/abdcf2 65. Beaulieu L, Arreak A, Holwell R, Dicker S, Qamanirq O, Moorman L, et al. Indigenous self-determination

in cryospheric science: The Inuit-led Sikumik Qaujimajjuti (“tools to know how the ice is”) program in Inuit Nunangat, Canada. Frontiers in Earth Science. 2023; 11. Available: https://www.frontiersin.org/ articles/10.3389/feart.2023.1076774. 66. Sharma S, Blagrave K, Magnuson JJ, O’Reilly CM, Oliver S, Batt RD, et al. Widespread loss of lake ice around the Northern Hemisphere in a warming world. Nat Clim Chang. 2019; 9: 227–231. https://doi. org/10.1038/s41558-018-0393-5 67. Sharma S, Blagrave K, Filazzola A, Imrit MA, Hendricks Franssen H-J. Forecasting the Permanent Loss of Lake Ice in the Northern Hemisphere Within the 21st Century. Geophysical Research Letters. 2021; 48: e2020GL091108. https://doi.org/10.1029/2020GL091108 68. Heino J, Culp JM, Erkinaro J, Goedkoop W, Lento J, Ru¨ hland KM, et al. Abruptly and irreversibly chang- ing Arctic freshwaters urgently require standardized monitoring. Journal of Applied Ecology. 2020; 57: 1192–1198. https://doi.org/10.1111/1365-2664.13645 PLOS ONE Changing ice conditions inhibit safe use PLOS ONE | https://doi.org/10.1371/journal.pone.0313994 December 11, 2024 19 / 19