Ted Nordhaus deserves a nod for doing what few in the climate establishment ever do: admitting he was wrong. In his essay “I Thought Climate Change Would End the World. I Was Wrong” (The Free Press, Oct. 19, 2025), Nordhaus concedes that his worldview “was built on apocalyptic models sprung from faulty assumptions”. That sentence alone marks a watershed moment in the long, strange saga of climate alarmism. It’s rare to see one of the movement’s own architects confess that its foundations were exaggerated, its projections implausible, and its tone hysterical.
Nordhaus co-founded the Breakthrough Institute, an organization that has long tried to make climate activism sound reasonable by marrying environmental rhetoric to talk of innovation and modernization. For years, he and his colleagues accepted the central dogma—that the planet faced an existential crisis unless humanity swiftly abandoned fossil fuels. They were not content to question the science; they amplified it. “The heating of the earth,” Nordhaus once wrote in 2007, “will cause the sea levels to rise and the Amazon to collapse and… trigger a series of wars over basic resources like food and water”.
Now, almost two decades later, he confesses that such scenarios were never plausible. The old models assumed “high population growth, high economic growth, and slow technological change”—a trifecta of contradictions that cannot coexist. He points out that fertility rates are falling, economies are decarbonizing on their own, and technological progress accelerates efficiency regardless of political slogans. His admission is blunt: “I no longer believe this hyperbole.”
That’s refreshing honesty.
More remarkable still is Nordhaus’s acknowledgment that the so-called “worst-case” scenarios—those beloved by headline writers and politicians—have been quietly revised downward. “Most estimates of worst-case warming by the end of the century now suggest three degrees or less,” he writes, yet “the reaction among much of the climate science and advocacy community has not been to become less catastrophic”. Instead, the doomsday clock has simply been reset. The goalposts move, but the panic remains.
It’s a classic feature of ideological systems: when the facts soften, the rhetoric hardens.
Nordhaus even notes the extraordinary decline—over 96 percent—in global mortality from climate and weather extremes over the past century. Despite the supposed “age of extremes,” fewer people than ever are dying from heat, cold, storms, or floods. The world, far from teetering on the brink of climate apocalypse, is enjoying the safest and most technologically protected era in recorded history. Yet, as he observes, this reality has not penetrated the climate advocacy bubble.
He credits Roger Pielke Jr. for showing that, once normalized for wealth and population, disaster losses have not increased with warming. The catastrophe narrative, in other words, fails its own empirical test. Nordhaus admits the data “overwhelm the climate signal,” because what determines the cost of disasters isn’t just the weather—it’s how rich, prepared, and well-built societies are.
This is where Nordhaus shines: his understanding that risk is a function of vulnerability, not temperature. A wealthy city can withstand what would devastate a poor one. A stronger economy produces better infrastructure, medicine, and recovery systems. And that, of course, is the irony of climate alarmism: the very economic growth that activists decry is what protects humanity from nature’s dangers.
He goes further still, dismantling the myth of the “accelerating catastrophe.” He notes that even in cases where warming might be slightly higher than expected, “additional anthropogenic warming is an order of magnitude less than the oscillations of natural variability”. That line should be carved into the lintel of every climate ministry on Earth. Yet it won’t be. Because once you admit that natural variation overwhelms human influence, the case for massive social reorganization collapses.
Nordhaus concedes what skeptics have said for decades: “Climate change is contributing very little to present-day disasters”. Even if one entertains the “worst-case scenarios,” the outcomes “are not remotely consistent with the sorts of catastrophic outcomes that I once believed in.”
At this point one expects him to throw off the last vestiges of belief. But Nordhaus, to his credit and perhaps to his lingering faith, doesn’t. He remains an adherent of the idea that anthropogenic warming is real, though modest; that cleaner technologies are desirable; and that innovation can be good policy. In that sense, he is a reformer, not a heretic. He has left the cathedral, but he still genuflects at its door.
Even so, his recognition of the movement’s intellectual corruption is devastating. He writes that “there are strong incentives to overestimate climate risk if you make a living doing left-of-center climate and energy policy”. The system rewards conformity. Academics, think-tankers, foundation officers, and congressional staffers—each depends on the maintenance of the “existential threat” narrative. Without that, the money dries up.
He calls it what it is: “The climate movement has effectively conflated consensus science about the reality and anthropogenic origins of climate change with catastrophist claims about climate risk, for which there is no consensus whatsoever”. That distinction between modest warming and apocalypse is the very distinction that has been erased in public debate.
Nordhaus is right again when he identifies the sociological roots of this hysteria. He cites research showing that highly educated people are more prone to error when facts threaten their political identities. In other words, the smarter you are, the easier it becomes to rationalize your ideology. It’s a dangerous cocktail: intelligence mixed with conformity.
He also takes aim at the notion that fear is necessary to spur innovation. “There is no evidence whatsoever,” he writes, “that 35 years of increasingly dire rhetoric… have had any effect on the rate at which the global energy system has decarbonized”. Indeed, the planet decarbonized faster before climate change became a cause célèbre. That’s a stunning admission from one of the movement’s intellectuals. If the sermons don’t speed progress, what’s the point of the religion?
Nordhaus’s answer is uncomfortable but true: the climate establishment “is actually after something different… a rapid and complete reorganization of the global energy economy.” Not modest improvement—revolution. And, as he admits, “there is no good reason to do that absent the specter of catastrophic climate change.”
This is where Nordhaus touches the third rail: the political motive. For decades, climate rhetoric has served as the scaffolding for an agenda of central control. What began as environmental concern metastasized into a technocratic movement bent on redesigning civilization. Nordhaus’s essay exposes the psychological and institutional drivers of that impulse, even if he doesn’t quite condemn them.
To his credit, he also observes that this culture of exaggeration and moral panic has made the movement “deeply out of touch with popular sentiment”. One might say the public has already performed its own cost-benefit analysis and found the apocalypse unpersuasive. Ordinary citizens sense what Nordhaus now admits: the climate “crisis” is a projection, not a prediction.
Eric’s post yesterday traced the same arc—from belief to realism. Nordhaus adds intellectual flesh to that skeleton. Nordhaus reveals the sociology of it: how the right credentials and the right funding streams can blind even intelligent people to basic empirical truth.
In a way, Nordhaus’s journey mirrors that of many early believers who confused model outputs with observations and mistook correlation for causation. Yet his willingness to re-examine the evidence—and to say publicly that he was wrong—marks a break from the consensus culture that has long punished dissent.
There’s still some theology left in him; he remains, after all, an “ecomodernist,” which is just a secular way of saying “green but not crazy.” But his essay is an important crack in the facade. He has turned his back on catastrophe, and that’s no small act of courage in a world where even measured skepticism gets one excommunicated.
For that, Ted Nordhaus deserves genuine respect. He may not yet be a full skeptic, but he has done something rare in the climate priesthood: he has confessed that the prophecies were false.
And perhaps, in time, he’ll see that the real danger was never the weather. It was the arrogance of those who thought they could control it.
Seems a bit odd, the USAID/NGO money spigot got turned off and suddenly the guiding lights of the climate catastrophe cabal are having epiphanies all over the place. Very odd indeed.
Classic “follow the money.” No money, no followers.
Short, simple, accurate.
Great comment! Thanks!!!
It’s not odd.
Those protesters all around the world who are being paid by Soros&Friends
lose their motivation to protest when they don’t get paid.
Climate Experts are just the aristocracy amongst professional activists.
It would be interesting to hear why it took him so long to come to the same conclusion his buddy Shellenberger came to many years ago.
I know people who are going to protest things that I think are silly, and I know them well enough to know nobody’s paying them – maybe that’s what I most think is silly, the “no pay” angle. If only one person is paid to protest a thing, then every other unpaid protester of that same thing is made a fool?
But who is organizing and hyping the protests? They are clearly not “grass-roots” events.
As for the herd, they follow, if for no other reason than to maintain appearances or just for the fun of belonging.
There’s a big difference between dimwitted intelligensia who’s livelihood depends on the status quo and the bemasked blue hair karens / masked up antifa hooligans being organised and paid.
Yet, they are same easily influenced self-interested fools.
You absolutely nailed it. The combination of the Trump and DOGE funding cuts along with the upcoming end of the CO2 Endangerment Finding means that the funding has dried up and is unlikely to resume. Isn’t it amazing how easy it is to believe a falsehood when you paycheck relies on believing it. The real scientists in the cult clearly heard the truth and just chose to ignore it. Now they’re scrambling to get ahead of the consequences.
“The real scientists in the cult clearly heard the truth and just chose to ignore it.”
I think so, too. It’s not that difficult to realize there is no real evidence that CO2 is doing what Climate Alarmists claim it is doing. Even a non-scientist can figure this out if they study the subject a little bit.
Good News: Nordhaus sees flaws in climatists’ POV.
Bad News: Nordhaus skeptical his blinded colleagues will open their eyes.
Some excerpts from his statement (my bolds)
Why do so many smart people, most trained as scientists, engineers, lawyers, or public policy experts, and all who will tell you, and I say this not ironically, that they “believe in science,” get the science of climate risk so badly wrong?
There are, in my view, several reasons. The first is that highly educated people with high levels of science literacy are no less likely to get basic scientific issues wrong than anyone else when the facts conflict with their social identities and ideological commitments. Yale Law Professor Dan Kahan has shown that people who are highly concerned about climate change actually have less accurate views about climate change overall than climate skeptics and that this remains true even among partisans with high levels of education and general science literacy. Elsewhere, Kahan and others have demonstrated that on many issues, highly educated people are often more likely to stubbornly hold onto erroneous beliefs because they are more expert at defending their political views and ideological commitments.
The second reason is that there are strong social, political, and professional incentives if you make a living doing left of center climate and energy policy to get climate risk wrong. The capture of Democratic and progressive politics by environmentalism over the last generation has been close to total. There is little tolerance on the Left for any expression of materialist politics that challenge foundational claims of the environmental movement. Meanwhile the climate movement has effectively conflated consensus science about the reality and anthropogenic origins of climate change with catastrophist claims about climate risk for which there is no consensus whatsoever.
Finally, there is a widespread belief that one can’t make a strong case for clean energy and technological innovation absent the catastrophic specter of climate change. “Why bother with nuclear power or clean energy if climate change is not a catastrophic risk,” is a frequent response. And this view simply ignores the entire history of modern energy innovation. Over the last two centuries, the world has moved inexorably from dirtier and more carbon intensive technologies to cleaner ones. Burning coal, despite its significant environmental impacts, is cleaner than burning wood and dung. Burning gas is cleaner than coal. And obviously producing energy with wind, solar, and nuclear is cleaner than doing so with fossil fuels.
Full Nordhaus article is here:
https://rclutz.com/2025/08/14/why-climate-doomsters-cant-recant/
Yep, like I said, shut off the free money and suddenly the anointed begin having epiphanies. Imagine that.
As fine as Nordhaus’ capitulation is, he still stands behind all those who recognized from the start that climate change alarmism was a Trojan Horse. I wouldn’t put him on a pedestal of any height until he has undone all the damage he caused before he admitted the existence of reality. It’s not as if 550 million years of planetary climate history was ever hidden from him to see it if he wanted to; it has always been easily available and has demonstrated the climate swings that are normal on this planet, with or without man, and not tied to atmospheric CO2 content. He chose to ignore all that scientific evidence for a long time, and the costs of his promoting the mass delusion of a modern tulipmania will take a lot longer than he will live for societies to pay off.
I understand your point, Nordhaus missed the obvious. Many people have been laboring for years telling the truth and were smeared for doing so. They showed real courage.
But it takes a special kind of courage not just to admit you’re wrong, but do it publicly, in a way that many of his friends and allies will see as a complete betrayal. I suspect that the hiding he will take from people he considered friends will be punishment enough for coming late to the party. We would be wise to welcome him graciously.
I do appreciate the points made; however Nordhaus did this with known effect of his intensity and stature. Is it not like yelling ‘FIRE!’ in a crowded theatre for years; are we then to express admiration when he stops? I’m suggesting–not until he undoes all the damage he caused. (And I do understand that might be ‘never’.)
The best I can do is to stop calling him an ignorant fool for not recognizing the planet’s climate history as recorded in the rocks. He doesn’t have to be a geologist to have understood that, but he might have talked to a few of us.
As Charles MacKay observed in “Extraordinary Popular Delusions…” men go mad in herds but only regain their senses slowly and one at a time.
That explained Covid to a “T.”
Well said.
But what Len said is also true. Yes, Nordhaus and all the other climate catastrophists have done vast damage to the wellbeing of mankind and the planet. Trying to condemn the developing world to endless poverty in order to “save the planet” is pure evil as well as pure stupidity.
But Nordhaus should be congratulated for seeing the light, however obvious that light has always been and – perhaps more importantly – having the courage to tell the world that he was utterly wrong. He will need more courage to face the inevitable attacks from the cult he has left behind.
Let us hope that his example will inspire more cultists to follow him. If his actions help to loosen the grip of the climate cult on humanity then he will have done a huge service to all of humanity.
I propose a compromise. Nordhaus will be responsible for a fair number of adherents to climate alarmism–as I said above, people that he convinced using his intensity and stature while advancing the concepts of doom. How about we praise him when he brings all those cultists with him as converts to climate reality?
All cults are irrational and delusional.
Amen, Len!
We need a litmus test. Stepping back from the cliff is progress but statements on the record are required.
“Yes or No: RCP8.5 is not realistic and should not be used in climate predictions/projections and is not suitable for determining public policy.”
None of the RCPs are realistic, because they are all based on erroneous premise of CO2 emissions affecting the climate..
Another one for Mr. Nordhaus:
Yes, or No: Is there any evidence that CO2 causes the Earth’s climate to change, now, or in the past?
Wow, at this rate we can expect Michael E Mann to come along and tell us,” well maybe strangers gurning in aisle nine if Wegmans may not have been so bad at first stated”.
Being serious, I think the alarmists have realised their exaggeration has been realised by society and now they are starting to feel the heat of their lies.
To a too small degree the MSM and ex-Biden staffers are doing the same thing.
So some are writing books to continue to cash in.
Some are just trying to regain credibility (Sorry, MSM, that ship has sailed.) others are just want the cash.
Would he have admitted he was wrong if elections went the other way and he had another 4 USA years of funding?
You nailed it!
This is a great article, and good for Ted Nordhaus for admitting he was wrong, overall, about AGW/CAGW panic.
However this statement in the above article (14th paragraph) indicates he still has a way to go in his recovery (my bold emphasis added):
“He calls it what it is: ‘The climate movement has effectively conflated consensus science about the reality and anthropogenic origins of climate change with catastrophist claims about climate risk, for which there is no consensus whatsoever‘.”
Mr. Nordhaus also needs to recognize and admit that there is no such thing as “consensus science” . . . that the word “consensus” in nowhere to be found in any proper description of The Scientific Method.
Well, there is consensus science.It’s political science also called Lysenkoism.
It is science that is factually wrong but politically correct.
Wasn’t the content of climategate to use tricks and get rid of the MWP?
Rewriting history in a domain where the empiric process is fundamental can and will only lead to more politics..more scams…more lies.
And this will attract all the wrong people to join climate science and such a negative selection usually end in a disaster.
The germans have a good saying that sums up consensus science very well.
“Eat shit. 100 billion flies can’t be wrong”
“to use tricks and get rid of the MWP?”
That was specifically the IPCC, Michael Mann plus his NOAA and MetO pals, because the existence of the MWP harmed their smoothed models of temperature.
There are many other IPCC chapters devoted to many facets of alleged global warming forcing out the real scientists, installing the pseudo scientists and pushing fake science to remake the world’s economics into a world of socialists with specially chosen heads of state to rule over their new socialist countries…
Climategate was the release of troves of emails proving that climate science was involved with world’s meteorological institutions, economic upheaval and socialist plans for democracies.
CAGW alarmism was to remake the world economies into socialist financial support systems.
The propaganda machine has successfully brainwashed a critical mass of idiots that climate change=dangerous warming. In my experience no amount of empirical data can shake true believers from this delusion.
I’ve been accused of contributing to human extinction for citing official measured data…
Very nice Charles, this is really important and a bigger win than I originally thought.
“economies are decarbonizing on their own”
They are?
Exactly. He is still deluded, believing CO2 from fossil fuels can keep warming the planet, he is merely admitting that the warming isn’t “catastrophic.” I wouldn’t characterize this as a mea culpa until he recognizes that CO2 from human activity is a negligible cause of modern warming and that 20th century warming is an entirely natural manifestation of solar and oceanic macrocycles.
The only decarbonization that is going on is the switch from coal to natural gas for generating electricity.
And that is 100% the result of gas becoming cheaper than coal, and that was only because of frakking natural gas wells. Something the left is also completely opposed to.
Is the coal-to-gas change still ongoing? I thought the transition crossed “mostly done” a while back.
Good question.
There is a coal-fired power plant about 20 miles from my home, and President Obama was trying to force it to switch to natural gas but that all went by the wayside after Trump got elected the first time, and the coal-fired power plant is still burning coal, and I haven’t heard any talk of converting it to natural gas.
I think Trump is enthusiastically promoting coal at the present time.
Not to rain on this parade, but I don’t see this as an epiphany. A necessary and pragmatic course correction, maybe, now that the U.S. has voted its way out of the absurd “existential crisis” that never was. Give DJT credit for being very clear about what he would do if elected, and now it is happening.
The real wake-up moment will be when Nordhaus and others finally realize that the core claim was unsound on scientific grounds all along. Incremental CO2 should never have been considered capable of driving “warming” at all – most certainly not to any harmful extent.
This is why I keep going back to 1938 about the Callendar paper:
https://wattsupwiththat.com/2025/04/06/open-thread-138/#comment-4058322
And to the ERA5 hourly values of the “vertical integral of energy conversion” :
https://drive.google.com/drive/folders/1PDJP3F3rteoP99lR53YKp2fzuaza7Niz?usp=drive_link
Thank you for your attention to this matter.
The corollary “core claim” is that warmth is somehow undesirable. The planet has almost always been warmer than today. Warmth is a boon, not a catastrophe. Life would be more abundant if the Earth warmed significantly. The very basis of the panic, that more warmth is bad, is a misjudgment. Maybe someday Nordhaus will catch that clue. I don’t see where he has yet.
IF the universe is expanding
AND the law of conservation of energy applies
THEN in the longest run it’s going to get cold
Except for the fact that we now scientifically acknowledge the existence of BOTH dark matter and dark energy . . . you know, the “stuff” that collectively comprises about 95% of the “known” universe.
Without any idea of their origins and their interactions with “normal” matter and energy (beyond interacting with gravity in both cases), it hard to say exactly what laws apply to the future.
“The very basis of the panic, that more warmth is bad, is a misjudgment.”
If it were cooling, and it could plausibly be blamed on human impact, I’m sure the flip would be impressive to watch. My point is that the “warming is bad” line of persuasion was implemented only because it is warming in any case, to promote the false guilt of human impact. So in my view, it is not a core claim but a tactic. Still, you are absolutely correct, that on its own merits, warming from the pre-industrial conditions is a good thing, not bad.
So, will the Climate Crusaders be burning him at the stake, or just the usual hanging? Just wondering.
For Mann, the standard response is lawsuit. For the rest, the standard response is none.
Softened targets and admissions things were overboard…
I doubt that he is a skeptic, yet.
More like looking for his next scam…
Two decades of mistake and your lucky if you get an Edward Markey type response of “who could have known” (from the case of the Jimmy Carter energy policy mistakes).
Well, he did finally figure it out. After the Zeitgeist™ began to frown on the whole thing.
Most of that crowd are too out of shape to maintain keen sense of smell or good reaction. But once their funding becomes uncertain, expect many surprised gasps to raise in a choir, ⅩⅩ Congress of CPSU style.
I maintain that the real climate crisis pertains to the growing concern that the alarmists have been experiencing when they have been seeing an increasing backlash from consumers, businesses and industries. These groups have become increasingly resentful of government levies, mandates, laws and restrictions that have been costing them more money and triggering more inconveniences and discomforts, while the climate is hardly changing at all. It’s just the standard series of weather events that’s having no drastic effect on people’s lives or human progress beyond the normal. So the real crisis is just being felt by the con-men who aren’t collecting the anticipated revenue from higher environmental taxes and overpriced green products.
No, he calls it what he thinks it is, and is still wrong. There is no evidence that climate change is “anthropogenic” at all. That is NOT “reality,” it is just another belief system he hasn’t yet challenged with facts.
One step at a time.
Hmm, yes. Looks bold and edgy without any explicit heresy.
I must confess to not recognizing his name.
For insight I went to wikipedia as the ever reliable source of lopsided propaganda on political issues. There I found that the enemies of reason had long ago cast him out of the camp of true believers and decided that they never really liked him anyway.
Still, as Charles Mackay observed “Men, it has been well said, think in herds; it will be seen that they go mad in herds, while they only recover their senses slowly, one by one.”
Actually …
The real danger of the climate catastrophe movement was and is the arrogance of those who thought they could use controlling the climate as an excuse for controlling the economy.
What? No h/t credit? 🙂
I was pretty nasty to him in comments (different user name). Glad WUWT is drawing attention to it. But at end of day, MSM is studiously ignoring it. A founder of Green Peace defects, ignore it. Lovelock recants just before he dies, ignore it. The last steel mill in Britain, the country that sparked the industrial revolution closes because windmill power is not cost effective, ignore it. This is the beginning of the end for the alarmists but the end is still a long way out.
If I remember correctly, Anthony at the beginning bought into the CAGW stuff. Then a mentor(?) of his gave him a tour of some of the temperature sites that fed in the raw data all the CAGW “stuff” was based on.
An honest, thinking, meteorologist looked at the sites the where the sources of the temperature data came from.
Welcome to WUWT!
PS He also asked something about asparagus. 😎
sorry. i don’t laud people trying to escape the consequences of their actions.
So, is he going to hand back the money he’s made off his hysteria?
Is he going to help the children who’ve been indoctrinated to the detriment to their mental health by his doom mongering?
Is he going to divvy up for the millions of people affected by the cost of energy due to the non-sensical building of wind and solar?
Thought not.
More epiphanies to come please.
From the article: “He calls it what it is: “The climate movement has effectively conflated consensus science about the reality and anthropogenic origins of climate change”
Nope. Claiming CO2, natural or human-caused, causes the Earth’s climate to change has never been shown to be reality. There is no evidence for it. One wonders what Nordhaus bases this belief on since he can’t point to one example of this being the case in the real world? It’s just one more of his unsubstantiated assumptions about CO2. His thinking still has a ways to evolve.
Before claiming something is true, we need evidence of it, Mr. Nordhaus. There is no evidence CO2 causes the Earth’s climate to do anything it otherwise would not do. It’s not there. It’s never been there.
Neither is there conclusive evidence that the witches make milk sour. But obviously for purpose of acting on this hypothesis evidence matters less than whether the powers-that-be think a witch hunt may serve their interests.
Generally being justified by an unfalsifiable theory is an advantage for any Great Cause:
Which is why those Spirit Whales, while too on the nose, entirely fit, ahem, the spirit of the thing.
Nice article, thank you Charles.
There are comments about social concepts like epiphany but these are mere gossip when the big item is the conduct of proper, hard science and its most supportable interpretation.
That would seem to be that greenhouse gases (horrible label) can warm air, but that an abundance of processes is available to dissipate that warmth and to keep in operation mechanisms that, to our best knowledge, have over history kept global temperatures in a narrow range that is NOT a catastrophic threat to people. In short words, we have to cause a con to go away by honest science and not by a type of science that includes guesses and assumptions. Geoff S
Ted’s Uncle, William Nordhaus, gave life to the 2 degC meme in 1975:
CAN WE CONTROL CARBON DIOXIDE? William D. Nordhaus June 1975 http://pure.iiasa.ac.at/365/1/WP-75-063.pdf
“As a first approximation, it seems reasonable to argue that the climatic effects of carbon dioxide should be kept well within the normal range of long-term climatic variation. According to most sources the range of variation between climatic (sic) is in the order of ± 5 °C., and at the present time the global climate is at the high end of this range.
If there were global temperatures more than 2 or 3°C. above the current average temperature, this would take the climate outside of the range of observations which have been made over the last several hundred thousand years.
Within a stable climatic regime, the range of variation of ± l °C is the normal variation: thus in the last 100 years a range of mean temperature has been 0.7°C.”
In 1977, Nordhaus expanded on his theme in Discussion paper 443 for the Cowles Foundation at Yale:
“Strategies for the Control of Carbon Dioxide” http://cowles.yale.edu/sites/default/files/files/pub/d04/d0443.pdf
In this paper he repeated a lot of his IIASA paper, including the seminal paragraph: “If there were global temperatures more than 2 or 3°C. above the current average temperature, this would take the climate outside of the range of observations which have been made over the last several hundred thousand years.”
However, he changed his figure for the range of variation within a stable climatic regime “such as the current interglacial”, from l°C, to 2°C and said that in the last 100 years a range of mean temperature had been 0.6°C, rather than his earlier 0.7.
In 1990, the UN AGGG (United Nations Advisory Group on Greenhouse Gases), was asking for no more than a 1 degree rise in global temperature. That in turn traces back to the Villach Conference of 1986, and the subsequent Bellagio Conference in 1987, when some of the main proponents of AGW were present. That then morphed into 1.5 degrees and again into 2 degrees. After Paris, 1.5 degrees became the new mantra.
Admitting to mistakes is fundamental to learning and human development. This is by far the biggest barrier preventing the left from understanding how things work in the real world. Their personal identities are married to tribal conformity to propaganda so any information outside of their echo chambers is a threat to who they are. An egoistic need to be seen as the virtuous overrides reason to preserve that false self they allowed to be created from a lack of self worth.
Huge that Nordhaus is providing a path to reason for the pathetically ignorant.