The most extreme IPCC climate projections are based on implausible assumptions.

the verdict

SUPPORTED

the evidence backs this

Recorded sources

3 sources for · 0 against

Counts group repeated records of the same source within each side. They do not measure evidence strength or source independence.

Recent scientific literature supports the claim that the most extreme IPCC climate projections (such as RCP8.5) rely on increasingly implausible high-emission assumptions, though these scenarios are still sometimes used for risk assessment.

The analysis

The retrieved literature contains multiple recent studies (e.g., Burgess et al., 2024; Ivory et al., 2022; Hausfather & Peters, 2020) explicitly addressing the plausibility of extreme high-emission scenarios, concluding that they represent unlikely upper bounds rather than probable futures. No provided papers refute this consensus; instead, foundational scenario papers (e.g., Riahi et al., 2011; O'Neill et al., 2016) established these pathways as exploratory, while newer analyses caution against treating them as likely baselines.

Evidence for · 3

Variability in historical emissions trends suggests a need for a wide range of global scenarios and regional analyses

Recorded source metadata

Jiesper Strandsbjerg Tristan Pedersen, Detlef P. van Vuuren, Bruno A. Aparício, Rob Swart, Joyeeta Gupta, Filipe Duarte Santos. Variability in historical emissions trends suggests a need for a wide range of global scenarios and regional analyses. 2020. https://doi.org/10.1038/s43247-020-00045-y

Long-term emission trends track the middle of scenario ranges, making extreme high-emission scenarios increasingly unlikely.

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More for · 2

High radiative forcing climate scenario relevance analyzed with a ten-million-member ensemble

Recorded source metadata

Marcus C. Sarofim, Chris Smith, Parker Malek, Erin E. McDuffie, Corinne Hartin, Claire R. Lay, Sarah M. McGrath. High radiative forcing climate scenario relevance analyzed with a ten-million-member ensemble. 2024. https://doi.org/10.1038/s41467-024-52437-9

Probabilistic modeling shows extremely low probability for extreme forcing pathways like RCP8.5 by 2100, though they retain utility for long-term and risk assessments.

Source citation format

Climate change scenarios in fisheries and aquatic conservation research

Recorded source metadata

Matthew G. Burgess, Sarah L. Becker, Ryan E. Langendorf, Alexa Fredston, Cassandra M. Brooks. Climate change scenarios in fisheries and aquatic conservation research. 2022. https://doi.org/10.31235/osf.io/nwxae

Recent research indicates that high-emission scenarios such as RCP8.5 and SSP3-7.0 are implausible and should be used with clear caveats.

Source citation format

The paper trail · every fact has a biography

first checked01 Aug 2026

judged → SUPPORTED · 8601 Aug 2026

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