The United Nations’ Paris Agreement includes the aim of pursuing efforts to limit global warming to only 1.5 °C above pre-industrial levels. However, it is not clear what the resulting climate would look like across the globe and over time. Here we show that trajectories towards a ‘1.5 °C warmer world’ may result in vastly different outcomes at regional scales, owing to variations in the pace and location of climate change and their interactions with society’s mitigation, adaptation and vulnerabilities to climate change. Pursuing policies that are considered to be consistent with the 1.5 °C aim will not completely remove the risk of global temperatures being much higher or of some regional extremes reaching dangerous levels for ecosystems and societies over the coming decades.
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S.I.S. and R.W. acknowledge the European Research Council (ERC) ‘DROUGHT-HEAT’ project funded by the European Community’s Seventh Framework Programme (grant agreement FP7-IDEAS-ERC-617518). J.R. acknowledges the Oxford Martin School Visiting Fellowship programme for support. R.S. acknowledges the European Union’s H2020 project CRESCENDO “Coordinated Research in Earth Systems and Climate: Experiments, kNowledge, Dissemination and Outreach” (grant agreement H2020-641816). O.H.G. acknowledges support of the Australia Research Council Laureate program. This work contributes to the World Climate Research Programme (WCRP) Grand Challenge on Extremes. We acknowledge the WCRP Working Group on Coupled Modelling, which is responsible for CMIP, and we thank the climate modelling groups for producing and making available their model output. For CMIP the US Department of Energy’s Program for Climate Model Diagnosis and Intercomparison provides coordinating support and led development of software infrastructure in partnership with the Global Organization for Earth System Science Portals.
Nature thanks S. Davis, K. Tachiiri and the other anonymous reviewer(s) for their contribution to the peer review of this work.
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