The United Nations climate committee has formally withdrawn its most severe warming projections. The decision, completed earlier this month, removes the RCP8.5 scenario and its successor pathways SSP5‑8.5 and SSP3‑7.0 from the official set of climate futures. Those discarded pathways were built on assumptions that the committee now acknowledges were never plausible.
They imagined a near‑tripling of global coal use, an absence of any meaningful climate policy worldwide, and population growth pushing to the upper edge of demographic estimates. For roughly fifteen years, these scenarios served as a default “worst case” baseline in research, policy, and financial modelling.
President Donald Trump responded to the retirement on his Truth Social account on Friday. He characterised the move as a triumph over what he described as “Climate Alarmism nonsense.” In his post he wrote that the projections were “WRONG! WRONG!
WRONG!” and accused Democrats of employing them to advance a “GREEN NEW SCAM.” He framed the committee’s action as a victory for “TRUTH, SCIENCE, and FACT.” The practical implications of the change are extensive. For more than a decade, governments, central banks, and news outlets have relied on RCP8.5 as a reference point for high‑end risk.
Its influence shaped trillions of dollars in investment choices, informed insurance risk models, and set the parameters for major climate‑policy discussions. The committee’s own assessment now labels the underlying assumptions as unrealistic, describing the pathway as a stress test rather than a realistic “business as usual” outlook. The retirement marks the most notable shift in climate‑scenario methodology since the IPCC’s Fifth Assessment Report.
The newly adopted CMIP7 modelling framework, also finalised earlier this month, does not incorporate the discarded scenarios. Consequently, the next generation of climate projections will begin from a different baseline—one that, at minimum, aligns more closely with observable trends.
Importantly, the committee’s action does not deny that climate change is occurring. The report does not assert that warming has halted or that the phenomenon is a hoax. It simply states that the specific set of projections labelled RCP8.5 was overstated and implausible.
This distinction matters because, for years, activists and officials cited the scenario as evidence of imminent catastrophe—a claim the data did not support. With the extreme pathway removed, policy debates can now be grounded in scientific assessments that reflect attainable futures rather than a speculative extreme that was never expected to materialise.
This does not imply that the climate challenge is resolved; it means the framing of the discussion has been corrected, a shift that many observers say has been overdue. President Trump’s reaction follows a predictable pattern: he interprets the retirement as validation of his stance and uses it to criticise the Green New Deal and broader climate activism. Nevertheless, the core fact remains that the UN’s own climate committee has conceded that its signature worst‑case projection was not credible. The consequences ripple across sectors.
Investors will need to revise risk models that previously relied on RCP8.5. Regulators must reconsider stress tests built on the discarded scenarios.
The public may view the most alarming climate headlines of the past decade as having been founded on uncertain assumptions. Overall, the change represents a fundamental adjustment in how future climate trajectories are understood and communicated.
