IPCC Retires Its Most Implausible Global Warming Scenarios
“New and improved” climate models are offered, but the ‘plausibility vacuum’ remains. Furthermore, IPCC fails to acknowledge the damage to society and science done by its previous assessments.
The Intergovernmental Panel on Climate Change, or IPCC, is a United Nations body created in 1988 to periodically review and summarize what the scientific community knows about climate change, its causes, and potential responses.
It does not run its own experiments; instead, it assesses thousands of published studies and produces large assessment reports that then feed into international negotiations and national policies.
Those big assessment reports are organized into working groups, each focusing on different parts of the problem. One group looks at the physical climate system (temperatures, sea level, ice, etc.), another examines impacts and vulnerabilities, and a third evaluates mitigation options such as emissions reductions and technologies.
For years, those assessments pushed “Shared Socioeconomic Pathways” (SSPs) and “Representative Concentration Pathways” (RCPs) scenarios that were portents of dire futures. The elite media would then take those doomsday scenarios and publish climate hysteria, which in turn led to United Nations demands for NGO monies to be spent on control, studies, and more bureaucrats.
Back in the fall of 2025, President Donald Trump asserted that the “climate crisis hoax was over“. A good portion of that hoax was built on those IPCC assessments.
Now the IPCC is effectively retiring the most extreme, coal-heavy pathways and is replacing them with a more moderate set of scenarios better aligned with climate realities and genuine fuel-consumption considerations.
Climate expert Roger Pielke Jr. shares his thoughts on this change:
For well over a decade, a large portion of climate research and the use of that research has had a real-world version of this problem. The scenarios driving climate projections — the foundational assumptions about our collective future — described a world so removed from plausible reality that the projections built on them tell us more about a hypothetical future than about the one we are actually navigating.
The news that the most extreme climate scenarios have now been officially put out to pasture has now begun to spread far and wide. The scenarios — specifically, RCP8.5, SSP5-8.5, and SSP3-7.0. — were quietly retired last month by the international committee responsible for developing a new basket of official scenarios.
It cannot be overstated how significant this change is — the now-obsolete extreme scenarios underpin the work of the Intergovernmental Panel on Climate Change (IPCC), tens of thousands of research papers, government policy and regulation around the world, financial standards for the world’s banks, along with much of the media coverage of climate change, from which most people learn about climate science and policy.
Longtime readers of THB, and the outlets where I published before, will know that my colleagues and I have called for the retirement of the extreme scenarios for almost a decade. Now it has happened and the fallout inevitably will be significant.
Trump took a victory lap in the wake of this development.
“GOOD RIDDANCE! After 15 years of Dumocrats promising that ‘Climate Change’ is going to destroy the Planet, the United Nations TOP Climate Committee just admitted that its own projections (RCP8.5) were WRONG! WRONG! WRONG!” Trump chided on Truth Social.
The IPCC framework in question was used to forecast a dramatic rise in sea levels, global crop failures, rapid melting of glaciers, and more, which made some hardcore climate change activists fret about future extinction.
But ultimately, scientists cited data and argued that the push towards renewable energies made that scenario less likely.
Even with the modifications, Pielke does a deep analysis of the new models and concludes that the “plausibility vacuum remains“:
The deeper problem with the SSP/RCP architecture, as Justin Ritchie has documented at length, is that physical climate modeling became decoupled from the underlying IAM socio-economic scenarios.
Under the RCPs, scenario creators identified concentration pathways and the underlying socio-economic assumptions were expected to be filled in later. Whether the underlying assumptions actually described a coherent picture of the world was never systematically assessed.
Ritchie called this a plausibility vacuum — a situation where any combination of climate model inputs could be used without any assessment of the real-world plausibility of the assumptions.
To be fair, the new CMIP7 framework does address some earlier shortfalls. The new design specifies emission-driven runs as the default, which allows for carbon-cycle feedbacks. The harmonization of emissions to observed 2023 data is an improvement — CMIP6 harmonized to 2014, and that harmonization had become well out-of-date by the time AR6 came out.
However, the plausibility vacuum problem remains.
In other words, after years of breathless headlines, policy overreach, and taxpayer-funded alarmism built on speculative extremes, even the IPCC is quietly backing away from its most indefensible assumptions…without really admitting how much damage those scenarios did.
Instead of a full course correction, we get a partial recalibration layered atop the same shaky framework, where “plausibility” is still more suggestion than requirement. If this is what passes for scientific accountability in the climate arena, no wonder people are increasingly wary of “experts” and are starting to ignore climate hysterics.
https://legalinsurrection.com/2026/05/ipcc-retires-its-most-implausible-global-warming-scenarios/
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