Sea level rise risks and societal adaptation benefits in low-lying coastal areas

• Published in: Scientific Reports
• Main Authors: Magnan, Alexandre, K, Oppenheimer, Michael, Garschagen, Matthias, Buchanan, Maya, K, Duvat, Virginie, K E, Forbes, Donald, L, Ford, James, D, Lambert, Erwin, Petzold, Jan, Renaud, Fabrice, G, Sebesvari, Zita, van de Wal, Roderik, S W, Hinkel, Jochen, Pörtner, Hans-Otto
• Other Authors: LIttoral ENvironnement et Sociétés (LIENSs), La Rochelle Université (ULR)-Centre National de la Recherche Scientifique (CNRS)
• Format: Article in Journal/Newspaper
• Language: English
• Published: HAL CCSD 2022
• Subjects: [SDE.MCG]Environmental Sciences/Global Changes; [SDE.ES]Environmental Sciences/Environment and Society; [SHS.GEO]Humanities and Social Sciences/Geography; Arctic
• Online Access: https://hal.science/hal-03704373; https://hal.science/hal-03704373/document; https://hal.science/hal-03704373/file/2022_Magnan_et_al_SLR%20risk_Adaptation%20benefits_Scientific_Reports.pdf; https://doi.org/10.1038/s41598-022-14303-w

International audience Abstract Sea level rise (SLR) will increase adaptation needs along low-lying coasts worldwide. Despite centuries of experience with coastal risk, knowledge about the effectiveness and feasibility of societal adaptation on the scale required in a warmer world remains limited. This paper contrasts end-century SLR risks under two warming and two adaptation scenarios, for four coastal settlement archetypes (Urban Atoll Islands, Arctic Communities, Large Tropical Agricultural Deltas, Resource-Rich Cities). We show that adaptation will be substantially beneficial to the continued habitability of most low-lying settlements over this century, at least until the RCP8.5 median SLR level is reached. However, diverse locations worldwide will experience adaptation limits over the course of this century, indicating situations where even ambitious adaptation cannot sufficiently offset a failure to effectively mitigate greenhouse-gas emissions.