Abstract
Escalating impacts of climate change underscore the risks posed by crossing potentially irreversible Earth and socioecological system thresholds and adaptation limits. However, limitations in the provision of actionable climate information may hinder an anticipatory response. Here we suggest a reversal of the traditional impact chain methodology as an end-user focused approach linking specific climate risk thresholds, including at the local level, to emissions pathways. We outline the socioeconomic and value judgement dimensions that can inform the identification of such risk thresholds. The applicability of the approach is highlighted by three examples that estimate the required CO2 emissions constraints to avoid critical levels of health-related heat risks in Berlin, fire weather in Portugal and glacier mass loss in High Mountain Asia. We argue that linking risk threshold exceedance directly to global emissions benchmarks can aid the understanding of the benefits of stringent emissions reductions for societies and local decision-makers.
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Data availability
The CMIP6 simulations used in this study are available through the ESGF data portal at https://esgf-node.llnl.gov/projects/cmip6/. The ERA5 reanalysis is available through the Copernicus climate data store at https://cds.climate.copernicus.eu/datasets. Glacier simulations can be downloaded from https://zenodo.org/records/10908278 (ref. 85), https://zenodo.org/records/8286065 (ref. 86) and https://nsidc.org/data/hma2_ggp/versions/1.
Code availability
The code to reproduce the example for heat extremes in Berlin (Fig. 3) and the two other examples in Table 2 can be found at https://zenodo.org/records/13884188 (ref. 87).
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Acknowledgements
This publication is a result of the PROVIDE project funded by the European Union’s Horizon 2020 research and innovation programmes under grant agreement no. 101003687 (PROVIDE). P.P., T.L.F., C.M.K., R.D.L., Q.L., T.C.L., F.M., J.M., Y.Q., J.R., B.S., L.S., J.S., C.S., E.T. and C.-F.S. acknowledge funding from the European Union’s Horizon 2020 research and innovation programmes under grant agreement no. 101003687 (PROVIDE). Y.Q. acknowledges funding from the European Union’s Horizon 2020 research project no. 101081369 (SPARCCLE). L.S. is recipient of a DOC Fellowship of the Austrian Academy of Sciences at the Department of Atmospheric and Cryospheric Sciences, Universität Innsbruck (no. 25928). J.S. is funded by the German Research Foundation (DFG) under Germany’s Excellence Strategy—EXC 2037:’CLICCS— Climate, Climatic Change, and Society’—project number: 390683824. T.L.F. acknowledges funding from the HEurope TipESM project.
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Pfleiderer, P., Frölicher, T.L., Kropf, C.M. et al. Reversal of the impact chain for actionable climate information. Nat. Geosci. 18, 10–19 (2025). https://doi.org/10.1038/s41561-024-01597-w
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DOI: https://doi.org/10.1038/s41561-024-01597-w