IPCC rules high‑emissions climate scenario RCP8.5 implausible, sparking critique of net‑zero policies

The Intergovernmental Panel on Climate Change (IPCC) has declared the high‑emission pathway RCP8.5 “implausible”, labeling the decision “the most significant development in climate research in decades”. The ruling challenges the scenario that has underpinned many climate‑change forecasts and policy debates for the past 15 years.

Critics note that the UK Met Office repeatedly used RCP8.5 in its UK Climate Projections (UKCP18), shaping predictions of warming, rainfall changes and extreme events that informed UK industry and finance regulations aimed at net‑zero goals. The IPCC’s rejection calls into question those forecasts and the resulting policy measures.

Mainstream English‑language outlets such as The New York Times, the BBC and The Guardian have offered little coverage, while European media—including the Dutch De Volkskrant and German newspapers Berliner Zeitung and Die Welt—have reported on the decision. Science writer Roger Pielke Jr. highlighted the shift and its implications for climate communication and policy.