Jonathan Cohler

The Emperor Has No Clothes: How the IPCC Built a 38-Year Climate Empire on a Circle of Lies Summary of my talk at ICCC16 on April 8, 2026. The papers underlying this analysis are available at papers.jcohler.com. For nearly four decades, the world has been told a story. The story goes like this: the Earth is warming at an alarming rate, humans are causing it by burning fossil fuels, and unless we spend trillions of dollars to stop it, catastrophe awaits. Governments have reorganized their economies around this story. Children have grown up afraid of it. Scientists who questioned it have been ostracized. There is just one problem. The scientific foundation of that story — every single number the IPCC uses to tell it — is physically meaningless. Not uncertain. Not debatable. Physically meaningless, in the same way that the average of everyone's phone numbers in Washington, DC is meaningless. You can calculate it. The arithmetic works out fine. But the result tells you absolutely nothing about reality. This is not a fringe claim. It is a mathematical and physical demonstration, built on peer-reviewed papers and the foundational principles of thermodynamics. And once you see it, you cannot unsee it. The First Lie: A Temperature That Does Not Exist Everything begins with the Global Mean Surface Temperature, or GMST. This is the single number — usually expressed as an anomaly from a pre-industrial baseline — that the entire IPCC enterprise is built upon. When you hear that the Earth has warmed 1.2 degrees since the industrial revolution, you are hearing about GMST. When climate models project warming of 2 or 3 or 4 degrees by 2100, they are projecting changes in GMST. When the Paris Agreement sets a limit of 1.5 degrees, it is a limit on GMST. So what exactly is GMST? Here is where the story starts to unravel. Temperature, in physics, is what is called an intensive property. That means it describes the state of a specific physical system — a system that has boundaries, that is in or near thermal equilibrium, that has a single governing equation of state. You can meaningfully talk about the temperature of a cup of coffee, or a room, or the ocean at a particular depth, because each of those is a defined physical system. What you cannot do, without violating the laws of thermodynamics, is aggregate temperatures across systems that are not in thermal contact with each other and call the result a "temperature." The Earth's surface is not a thermodynamic system. It is a patchwork of thousands of local systems — deserts and rainforests, polar ice sheets and tropical oceans, mountain peaks and valley floors — none of which are in thermal equilibrium with each other. Averaging their temperatures produces a number, yes. But that number is not a temperature in any physically meaningful sense. It has no equation of state governing it. There is no physical law that connects it to anything. It is, as physicist Christopher Essex and colleagues demonstrated rigorously in a 2007 paper, simply not a temperature. This is not a technicality. It is the kind of category error that, in any other field of science, would end a research program immediately. Averaging intensive properties across non-equilibrium systems is like averaging the zip codes of everyone in New York City and then using the result to give someone directions. The arithmetic produces a number. The number means nothing. The International Organization for Standardization recognized this implicitly decades ago. ISO was tasked in 2002 with defining all important terms related to climate change — and to this day, "global average temperature" does not appear in their completed definitions. The omission is not an oversight. ISO's mandate requires metrological rigor, and "global average temperature" cannot survive it. Neither the IPCC nor any climate agency has ever produced a rigorous physical definition of GMST. They use it constantly — it appears in virtually every chapter of the IPCC's Sixth Assessment Report — but they have never defined what physical quantity it represents, because no such definition is possible. The Second Lie: Models Built on Nothing If GMST is physically meaningless, what are the IPCC's climate models actually doing? The answer is uncomfortable. Every major climate model used by the IPCC — the ensemble known as CMIP, the Coupled Model Intercomparison Project — is tuned to reproduce historical GMST trends. These models have hundreds of adjustable parameters, and those parameters are set so that the model's output matches the observed GMST record. This is called validation: you adjust the model until it fits the data, and then you declare that the model has been validated against observations. But if GMST is not a physically meaningful quantity, then tuning a model to reproduce it is not validation. It is curve-fitting against a number that has no physical content. The model learns to reproduce a mathematical artifact, not a physical reality. And because these are coupled global circulation models — where temperature interacts with precipitation, wind, ocean currents, sea ice, and dozens of other variables — the corruption spreads everywhere. Every projection the model produces, for every variable, inherits the original meaninglessness. The implications are staggering. Every temperature projection. Every sea level projection. Every extreme weather projection. Every carbon budget. Every remaining-emissions calculation. All of it flows from models validated against a quantity that does not physically exist. The Third Lie: An Ocean That Was Never Measured Recognizing that surface temperature records were contested and unreliable, the IPCC developed a second line of evidence: ocean heat content, or OHC. The argument was straightforward — if the planet is accumulating energy from the greenhouse effect, that energy must be going somewhere, and most of it should be going into the oceans. Measure the ocean's heat content over time, and you have a direct measurement of the planet's energy imbalance. This argument sounds compelling. It rests on a program called Argo — a network of roughly 4,400 robotic floats deployed across the world's oceans, each one diving to 2,000 meters and rising back to the surface every ten days, transmitting temperature and salinity profiles along the way. Argo is a genuine scientific achievement, an engineering marvel that has produced an enormous amount of valuable oceanographic data. But here is what Argo was actually designed to do, according to its founding documents from 1998: observe the evolving physical state of the upper ocean, track regional patterns of heat and salinity, support weather forecasting, and complement satellite altimeters. Global ocean heat content and Earth's energy imbalance are mentioned nowhere. The program was not designed for that purpose, and its design is fundamentally unsuited to it. The problem begins with basic physics. When an Argo float ascends from 2,000 meters to the surface over six to ten hours, it collects roughly 1,000 temperature measurements along the way. But the float is drifting the entire time. By the time it surfaces and phones home via satellite, it may be fifty kilometers from where its deepest measurements were taken. Those measurements are all assigned to the surface GPS position — the only location that is actually known. The actual underwater trajectory is entirely unknown. Every single data point below the surface is assigned to the wrong location. Then the interpolation begins. Those 12,000 real measurements per month — already spatially misassigned — are used to fill 45,000 three-dimensional grid cells covering the global ocean. The vast majority of the ocean is not measured at all; it is calculated. The polar regions, coastal zones, and marginal seas are largely excluded. About half the total ocean volume, including all water below 2,000 meters, is simply ignored. The calculations use correlation functions that blend measurements from water masses hundreds or even thousands of kilometers apart, destroying any local information the floats actually captured. The anomalies computed from this process — the differences from a historical baseline — then run into the same fundamental physics problem as GMST. Temperature is an intensive property. You cannot meaningfully average temperature anomalies across non-equilibrium volumes of ocean any more than you can average them across the Earth's surface. The resulting number has units attached to it, and the arithmetic is consistent, but it does not represent a physical reality. When all the genuine sources of uncertainty are properly quantified — the untracked trajectories, the interpolation errors, the deep ocean ignorance, the polar gaps, the mismatched measurement frameworks — the true uncertainty in the derived Earth Energy Imbalance figure is greater than plus or minus one watt per square meter at 95% confidence. The IPCC's AR6 reports it as 0.7 plus or minus 0.2 watts per square meter. The actual uncertainty is roughly five times larger than the signal being measured. The result is statistically indistinguishable from zero. The Fourth Lie: Satellites Adjusted to Match the Fiction The IPCC presents its ocean heat content figure and its satellite-derived energy imbalance figure as two independent lines of evidence that agree with each other. This agreement is cited as powerful confirmation that the Earth is accumulating energy at the rate claimed. What the IPCC does not prominently advertise is how that agreement was achieved. NASA's CERES instruments — satellites measuring the radiation budget at the top of the atmosphere — produce raw measurements with an absolute uncertainty of roughly three to five watts per square meter. The signal the IPCC claims to be measuring is 0.7 watts per square meter. The satellites, on their own, cannot resolve it. So what was done? The CERES data were adjusted — via a least-squares optimization — to force agreement with the Argo-derived ocean heat content estimate. The IPCC's own AR6 documentation acknowledges this directly: the CERES fluxes "were adjusted, within the estimated uncertainties, to ensure that the net TOA flux was consistent with the estimated Earth's energy imbalance based on ocean heat content measurements." In other words: they adjusted the satellites to match the floats, and then cited the match as independent confirmation. That is not science. That is circular reasoning with extra steps. This is not unprecedented behavior in the IPCC ecosystem. Kevin Trenberth, one of the architects of the ocean heat content framework, wrote in a now-famous 2009 email obtained through the ClimateGate disclosure: "The fact is that we can't account for the lack of warming at the moment and it is a travesty that we can't. The CERES data published in August shows there should be even more warming: but the data are surely wrong." When the satellites disagree with the models, the satellites are wrong. When the satellites are adjusted to agree, that agreement is cited as confirmation. The game is rigged by construction. The Fifth Lie: The CO₂ Fingerprint That Was Never There The final pillar of the IPCC's case is carbon dioxide attribution. Yes, CO₂ has risen in the atmosphere. Yes, human industrial activity emits CO₂. But the IPCC goes further, claiming that the rise in atmospheric CO₂ is almost entirely anthropogenic — that natural processes cannot account for it, and that the isotopic composition of atmospheric CO₂ provides an unambiguous human fingerprint. This claim rests on the Bern model, a mathematical framework describing how CO₂ moves between the atmosphere and natural reservoirs. The Bern model has a particularly alarming feature: it predicts that a substantial fraction of CO₂ emitted today will remain in the atmosphere for centuries or millennia. The IPCC's AR5 report states that fifteen to forty percent of emitted CO₂ will persist in the atmosphere for more than a thousand years. This is the foundation of carbon budgets and net-zero targets. The Bern model has been falsified by evidence that has been sitting in plain sight for sixty years. When atmospheric nuclear testing peaked in the early 1960s, it injected a massive pulse of radioactive carbon — bomb carbon-14 — into the atmosphere. This pulse has been tracked continuously ever since. If the Bern model were correct, that pulse should decay slowly, with a substantial permanent fraction remaining. Instead, it decays as a single exponential with an e-folding time of about seventeen years. The bomb carbon is gone. It cycled through the system and was absorbed — completely — in roughly half a century. The multi-exponential Bern model, with its permanent airborne fraction, is simply wrong. CO₂ does not persist in the atmosphere for millennia. It cycles through in years to decades. The isotopic evidence tells the same story. The carbon isotope ratio in atmospheric CO₂ — the quantity called delta-13C — is supposed to be declining as fossil fuel CO₂, which is isotopically light, mixes into the atmosphere. The IPCC treats this decline as the smoking gun of human causation. But a 2024 peer-reviewed study by Prof. Demetris Koutsoyiannis examined the actual isotopic data carefully and found something the consensus narrative cannot accommodate: the net isotopic input signature to the atmosphere has been essentially unchanged since the Little Ice Age. The value has remained stable — globally, across all major measurement sites, throughout the entire period of industrialization. A changing human fingerprint should show up as a changing net signature. It does not. The isotopic composition is consistent with natural biosphere dominance and an undetectable human contribution. The reason is not mysterious. The biosphere — plants, soils, oceans — cycles roughly twenty-five times more carbon per year than human industrial emissions. Natural processes are overwhelmingly dominant. Human emissions are noise on top of a vast natural signal. And temperature, not human activity, drives the dominant part of that signal: warming causes the biosphere to exhale more CO₂, which raises atmospheric concentrations. The causality runs from temperature to CO₂, not the reverse. 5 x 0 = 0 Step back and look at the full picture. The IPCC's case for human-caused climate catastrophe rests on five interlocking metrics: GMST, the climate models tuned to it, ocean heat content, Earth's energy imbalance derived from ocean heat, and CO₂ attribution. Each one is presented as an independent line of evidence. Together, the IPCC says, they constitute overwhelming proof. But they are not independent. They form a circle. GMST is physically meaningless. The models are tuned to GMST and inherit its meaninglessness. Ocean heat content is computed through a process that violates measurement physics and is statistically indistinguishable from zero. Earth's energy imbalance is derived from ocean heat content and confirmed by satellites that were adjusted to match it. CO₂ attribution rests on a model falsified by nuclear bomb data and an isotopic fingerprint that does not exist in the observations. Each element of the chain depends on the others. None stands independently. The IPCC calls this "multiple lines of evidence." But five times zero is still zero. What This Means None of this proves that the climate is not changing, or that human activity has no effect on the atmosphere. Climate changes continuously, and has for billions of years. What it demonstrates is that the specific metrics the IPCC uses to quantify the crisis — every number that drives the policy, every figure that justifies the spending, every projection that frightens the public — are built on a foundation that does not survive contact with basic physics. The International Organization for Standardization could not define global average temperature because it fails metrological requirements. Four different AI systems, presented with the mathematical arguments, reached the same conclusion independently. The emperor has no clothes — and even the tools his court built to defend him can see it. For thirty-eight years, an enormous scientific and political infrastructure has been constructed on top of these metrics. Trillions of dollars in spending have been justified by them. Careers, institutions, and international agreements depend on them. Questioning them has been treated as heresy. But physics does not negotiate. A number that has no physical meaning does not acquire one because important people find it useful. A measurement indistinguishable from zero does not become evidence of a crisis because a satellite was adjusted to agree with it. A model falsified by sixty years of bomb carbon data does not become valid because it has been cited ten thousand times. The work is done. The papers are published. The mathematics is there for anyone who wishes to examine it. The question now is not scientific. It is whether the institutions that built their empires on these numbers will acknowledge what the physics has always been trying to tell them. The emperor has no clothes. He never did. And it is long past time to say so. The presentation "The Emperor Has No Clothes" was delivered at the 16th International Climate Change Conference, Washington DC, April 8–9, 2026. 👇👇👇👇👇