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Scientists Retire Worst-Case Climate Scenario
Coverage from ScienceAlert, Climate Depot, and others
International climate researchers are retiring RCP8.
5 and its successor SSP5-8.5 from updated scenario sets because rapid growth in solar, wind, electric vehicles and batteries, along with climate policies, has reduced the plausibility of their extreme fossil-fuel assumptions. The change does not indicate that climate risks have been resolved: emissions remain high, the most optimistic pathways still imply some overshoot of 1.5°C, and current-policy pathways continue to point to substantial warming. The update also renews debate over how high-emissions scenarios should be used in research, public communication and policy.
The update strengthens the case for retiring RCP8.5 by tying it more explicitly to observed clean-energy growth and policy effects, while adding a sharper debate over how the scenario was used in research and public discourse. It also broadens the framing from simple scenario replacement to an ongoing argument about scenario misuse and communication.
The story has shifted from a narrower climate-scenario update to a broader methodological and policy-relevance debate. Beyond retiring the extreme pathway, the new version emphasizes how scenario changes affect stress tests, litigation, and public interpretation.