Summary

• RCP8.5 and SSP5-8.5 are being removed from updated climate scenario sets because their assumed surge in fossil-fuel use is no longer considered plausible by many researchers.
• Growth in solar, wind, electric vehicles and batteries, alongside climate policy, has slowed projected emissions growth but has not yet produced sustained global emissions declines.
• The retirement of the worst-case pathway does not invalidate earlier climate modeling or mean that climate impacts are becoming less severe.
• Updated pathways still include roughly 3.5°C or more of warming under high-emissions conditions, while the most optimistic paths generally involve a temporary breach of 1.5°C.
• The material presents current policies as falling between the most and least emissions-intensive pathways, leaving outcomes highly dependent on future policy and technology choices.
• A minority or advocacy-oriented strand of the discussion argues that RCP8.5 was widely misused as a likely forecast and influenced policy beyond its intended scenario role.