Abstract
Planetary boundaries represent thresholds in major Earth system processes that are sensitive to human activity and control global-scale habitability and stability. These processes are interconnected such that movement of one planetary boundary process can alter the likelihood of crossing other boundaries. Here we argue that the observed deoxygenation of the Earth’s freshwater and marine ecosystems represents an additional planetary boundary process that is critical to the integrity of Earth’s ecological and social systems, and both regulates and responds to ongoing changes in other planetary boundary processes. Research on the rapid and ongoing deoxygenation of Earth’s aquatic habitats indicates that relevant, critical oxygen thresholds are being approached at rates comparable to other planetary boundary processes. Concerted global monitoring, research and policy efforts are needed to address the challenges brought on by rapid deoxygenation, and the expansion of the planetary boundaries framework to include deoxygenation as a boundary helps to focus those efforts.
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Acknowledgements
K.C.R. acknowledges support from US National Science Foundation (NSF) grant nos 2048031 and 1754265. E.M.F. acknowledges graduate support from the NSF GRFP (UCSD DGE-2038238), UC San Diego (PPPF) and the Aburto Lab at the Scripps Institution of Oceanography, and postdoctoral support from UC Santa Cruz. S.R.C. acknowledges support from the North Temperate Lakes Long-Term Ecological Research programme from the NSF Cooperative Agreement no. DEB-2025982. S.C.D. acknowledges support from NSF grant no. IOS-2345023. V.C.G. and M.G. acknowledge support from the CE2COAST project funded by ANR (FR), BELSPO (BE), FCT (PT), IZM (LV), MI (IE), MIUR (IT), Rannis (IS), IRP MAST (Multiscale Adaptive Strategies) and RCN (NO) through the 2019 ‘Joint Transnational Call on Next Generation Climate Science in Europe for Oceans’ initiated by JPI Climate and JPI Oceans. V.C.G. also acknowledges support from the EU H2020 FutureMares project (Theme LC-CLA-06-2019, grant agreement no. 869300) and the Scientific Committee on Oceanic Research (SCOR) Working Group 155, funded by national SCOR committees and a grant to SCOR from the NSF (grant no. OCE-1840868). P.R.L. acknowledges support from the Canada Research Chairs programme and grants from the Natural Sciences and Engineering Research Council of Canada. M.G. acknowledges support from the EU H2020 BRIDGE-BS project under grant agreement no. 101000240 and the EU HE NECCTON project under grant agreement no. 101081273. S.F.J. was supported by the Cornell Atkinson Center for Sustainability. S.F.J. was also partially supported by a Society of Science Postdoctoral Fellowship from the University of Notre Dame. L.A.L. acknowledges support from an NSF AccelNet Program award no. 2114717 via University of Texas subaward no. 308056-0001A and the National Oceanic and Atmospheric Administration’s National Centers for Coastal Ocean Science Competitive Research Program under award no. NA18NOS4780172. V.C.G., L.A.L., D.B., A.O., S.C. and M.G. acknowledge fruitful discussions around the topic of deoxygenation as a potential planetary boundary, which took place within the Global Ocean Oxygen Network Working Group being supported by IOC UNESCO.
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Rose, K.C., Ferrer, E.M., Carpenter, S.R. et al. Aquatic deoxygenation as a planetary boundary and key regulator of Earth system stability. Nat Ecol Evol 8, 1400–1406 (2024). https://doi.org/10.1038/s41559-024-02448-y
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DOI: https://doi.org/10.1038/s41559-024-02448-y