Study: Dangerous Global Warming Could Occur by 2027

Guest essay by Eric Worrall

We laughed when Alexandria Occasio Cortez claimed that the world would end in 12 years. According to a new climate study, AOC is an optimist; we might only have seven years. But the authors appear to make some fairly pessimistic assumptions to achieve that prognosis.

Climate change: Threshold for dangerous warming will likely be crossed between 2027-2042

Scientists introduce a new way to predict global warming, reducing uncertainties considerably

Date: December 21, 2020
Source: McGill University

The threshold for dangerous global warming will likely be crossed between 2027 and 2042 — a much narrower window than the Intergovernmental Panel on Climate Change’s estimate of between now and 2052. In a study published in Climate Dynamics, researchers from McGill University introduce a new and more precise way to project the Earth’s temperature. Based on historical data, it considerably reduces uncertainties compared to previous approaches.

“Climate skeptics have argued that global warming projections are unreliable because they depend on faulty supercomputer models. While these criticisms are unwarranted, they underscore the need for independent and different approaches to predicting future warming,” says co-author Bruno Tremblay, a professor in the Department of Atmospheric and Oceanic Sciences at McGill University.

Until now, wide ranges in overall temperature projections have made it difficult to pinpoint outcomes in different mitigation scenarios. For instance, if atmospheric CO2 concentrations are doubled, the General Circulation Models (GCMs) used by the Intergovernmental Panel on Climate Change (IPCC), predict a very likely global average temperature increase between 1.9 and 4.5C — a vast range covering moderate climate changes on the lower end, and catastrophic ones on the other.

A new approach

“Our new approach to projecting the Earth’s temperature is based on historical climate data, rather than the theoretical relationships that are imperfectly captured by the GCMs. Our approach allows climate sensitivity and its uncertainty to be estimated from direct observations with few assumptions,” says co-author Raphael Hebert, a former graduate researcher at McGill University, now working at the Alfred-Wegener-Institut in Potsdam, Germany.

Read more:

The abstract of the study;

An observation-based scaling model for climate sensitivity estimates and global projections to 2100

Raphaël HébertShaun Lovejoy & Bruno Tremblay 

Climate Dynamics (2020)


We directly exploit the stochasticity of the internal variability, and the linearity of the forced response to make global temperature projections based on historical data and a Green’s function, or Climate Response Function (CRF). To make the problem tractable, we take advantage of the temporal scaling symmetry to define a scaling CRF characterized by the scaling exponent H, which controls the long-range memory of the climate, i.e. how fast the system tends toward a steady-state, and an inner scale 𝜏≈2τ≈2   years below which the higher-frequency response is smoothed out. An aerosol scaling factor and a non-linear volcanic damping exponent were introduced to account for the large uncertainty in these forcings. We estimate the model and forcing parameters by Bayesian inference which allows us to analytically calculate the transient climate response and the equilibrium climate sensitivity as: 1.7+0.3−0.21.7−0.2+0.3  K and 2.4+1.3−0.62.4−0.6+1.3  K respectively (likely range). Projections to 2100 according to the RCP 2.6, 4.5 and 8.5 scenarios yield warmings with respect to 1880–1910 of: 1.5+0.4−0.2𝐾1.5−0.2+0.4K, 2.3+0.7−0.52.3−0.5+0.7  K and 4.2+1.3−0.94.2−0.9+1.3  K. These projection estimates are lower than the ones based on a Coupled Model Intercomparison Project phase 5 multi-model ensemble; more importantly, their uncertainties are smaller and only depend on historical temperature and forcing series. The key uncertainty is due to aerosol forcings; we find a modern (2005) forcing value of [−1.0,−0.3]Wm−2[−1.0,−0.3]Wm−2 (90 % confidence interval) with median at −0.7Wm−2−0.7Wm−2. Projecting to 2100, we find that to keep the warming below 1.5 K, future emissions must undergo cuts similar to RCP 2.6 for which the probability to remain under 1.5 K is 48 %. RCP 4.5 and RCP 8.5-like futures overshoot with very high probability.

Read more:

From the study;

… For the high-emission scenario RCP 8.5, all methods show a high probability of a warming exceeding 2 K before 2100. According to the SCRF, the risk of overshooting 1.5 K is negligible before 2024 (or 2028), but extremely likely after 2036 (or 2047), similarly to the CMIP5 MME which reaches the 95% probability of overshooting 1.5 K in 2038. The 2 K threshold is also extremely likely to be crossed about 15 years later in 2055 for both the SCRF and CMIP5 MME (or 2068). …

Read more: Same link as above

The study authors appear to estimate a fairly low transient climate response, but a potentially high end equilibrium climate sensitivity.

… Our analysis supports better constrained TCR and ECS likely range than the IPCC AR5. When using 𝐹𝐴𝑒𝑟𝑅𝐶𝑃FAerRCP (or 𝐹𝐴𝑒𝑟𝑄𝑎FAerQa), the range shrinks from [1.0, 2.5] K to [1.4, 2.0] K for the TCR (or [1.2, 1.5] K) and from [1.5,4.5]𝐾[1.5,4.5]K to [1.8,3.7]𝐾[1.8,3.7]K for the ECS (or [1.5, 2.7] K); the median estimates also decrease from 1.8 K to 1.7 K (or 1.4 K) for the TCR and from 3.0 K to 2.4 K (or 1.8 K) for the ECS. This agrees with other recent observation-based studies (Otto et al. 2013; Skeie et al. 2014, and Johansson et al. 2015) which also support a downward revision of the ECS upper 17% bound by at least half a degree. In addition, the ECS500500 was found to be significantly smaller, 2.2+0.6−0.5𝐾2.2−0.5+0.6K (or 1.7+0.4−0.2𝐾1.7−0.2+0.4K), than the ECS. This implies that if the ECS is on the higher end of the CI, then a large fraction of the warming would be experienced hundreds of years after a potential stabilization of anthropogenic forcing. An important and rather conservative claim supported by this evidence is therefore that the upper 5% ECS bound and median of AR5 can be safely revised downward to 4.0 K and 2.5 K. The lower 5% bound of 1.5 K, on the other hand, remains reliable. …

Read more: Same link as above

Interestingly the TCR (Transient Climate Response) estimated by the authors appears to be fairly close to the ECS (Equilibrium Climate Sensitivity) estimated by Lord Monckton in his corrected feedback study. The authors of this study justify this difference between TCR and ECS by raising the possibility that the climate will take a long time to stabilise (“hundreds of years”) even if anthropogenic CO2 emissions were halted today, so a lot hinges on how much warming is still in the pipeline.

How can we get an estimate to constrain the ECS, without waiting for centuries for the climate to finish responding to anthropogenic CO2 emissions? One option is to consider past geological periods such as the Jurassic (1950ppm CO2, +3C global warming). If 1950ppm CO2 can only raise global temperature by 3C, even when the paleo-climate had millions of years to respond to elevated CO2 levels, this implies that ECS is small, and there is very little if any additional warming waiting in the pipeline. A low ECS implies that any anthropogenic global warming likely to occur as a result of our burning of fossil fuel is a total non event – we will run out of fossil fuel long before we reach 1950ppm. But this viewpoint does not appear to be popular with most government funded climate scientists.

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December 26, 2020 6:05 am

Criticism of supercomputer models is unwarranted?

Are they serious?

Trying to Play Nice
Reply to  fretslider
December 26, 2020 6:20 am

Well you can’t depend on real data, it doesn’t always agree with the meme.

Reply to  fretslider
December 26, 2020 6:24 am

Perhaps not, but when it comes to social control and stripping your personal wealth, they are deadly serious.

“I own nothing, I have no privacy and life has never been better.”

Reply to  Klem
December 26, 2020 7:06 am

To bee or not to bee, that is the question.

Reply to  shrnfr
December 26, 2020 7:28 am

Do stop droning on, shrnfr


Reply to  Redge
December 26, 2020 9:50 am

Whether ’tis nobler in the mind to suffer the slings and arrows of outrageous forecasting.

Bill Powers
Reply to  shrnfr
December 26, 2020 11:14 am

What’s all the Buzz about?

Reply to  Bill Powers
December 26, 2020 5:58 pm

I have no idea what they’re smoking.

Reply to  shrnfr
December 26, 2020 12:10 pm

Don’t you mean “Not The Bee”?

Reply to  fretslider
December 26, 2020 6:25 am

But the paper has something for everybody. It also says “Our new approach to projecting the Earth’s temperature is based on historical climate data, rather than the theoretical relationships that are imperfectly captured by the GCMs.” 

Ron Long
Reply to  DHR
December 26, 2020 10:43 am

DNR, shirley that is only a throw-away line, as the “historical climate data” shows 50 meters higher and 150 meters lower sea levels as “historical climate data” to go along with CO2 variance at least an order of magnitude. Eric W. has become quite the expert at findings political scientists willing to be-clown themselves, but then, it is a target-rich environment.

Reply to  Ron Long
December 26, 2020 6:01 pm

Yes, most of them are adding the letters CS to their CV hoping nobody discovers it’s an attempt to hide Climate Scientist as their specialty in geography.

Reply to  DHR
December 26, 2020 3:13 pm

What they are saying is that previous climate models were JUNK.

Well, YES.. we know that

Trouble is, this one is no better. !

Ian Magness
Reply to  fretslider
December 26, 2020 8:15 am

Looks like 𝐹𝐴𝑒𝑟𝑄𝑎FAerQa News to me.

Reply to  fretslider
December 26, 2020 8:34 am

Hey, it’s like voter fraud. You do not have to provide any counter argument you just repeat every day a spurious fallacy like ” these criticisms are unwarranted”. That’s enough, after all logic and science is just a manifestation of white privilege and should be shunned.

So please check your privilege, wind in your white supremacy talk and stop contracting all these well founded emotional arguments. That’s enough cis-gender patriarchy for one day, thank you.

Reply to  fretslider
December 26, 2020 10:12 am

The models show what they were designed to show. How could they possibly be in error? /src

Reply to  MarkW
December 26, 2020 6:04 pm

When the estimation variance is triple the estimate, forgive me for worrying.

I’ll just laugh in comic relief, instead.

Reply to  fretslider
December 26, 2020 5:56 pm

I’m still waiting for these “climate scientists” to embrace the extraordinarily high estimation variances associated with their “supercomputer-generated models” as justified criticism.

Maybe they’re so unfamaliar with statistics that they think the higher the estimation variance, the better their models are. My only response is “Sheesh!”

By the way, I saw no mention of the estimation variance associated with this new-fangled model, but why confront a new idea with reality, right?

Bemused Bill
Reply to  fretslider
December 26, 2020 7:07 pm

Hilarious, aint it? Soon you will be censored for making fun of their utterly failed predictions and secret peer reviewed modeling data. Data that David Evens has openly challenged any warmist wannabe into putting their inputs, suppositions etc through his vastly superior models and see what comes out….challenge denied.
So if they are not confident enough in their models that they would want them to be examined by the best….well then…screw you!

Reply to  fretslider
December 26, 2020 7:40 pm

Could, Would and Should are such important words in climate models.

December 26, 2020 6:13 am

A global temperature rise of 1.9 and 4.5C is going to be catastrophic?

I must be dead then, and just don’t know it!

Quite apart from the variation in day/night temperatures, when I travel between England and Scotland, only 400 miles or so, the temperature between the two is consistently around 5C.

No catastrophe so far, so I must be dead.

Trying to Play Nice
Reply to  Hotscot
December 26, 2020 6:22 am

I used to work on the fringes of Detroit and lived in the northern suburbs. The difference was consistently about 3 degrees on my drive to work and back home. I went through that temperature change twice a day for years and am still here to talk about it.

Reply to  Trying to Play Nice
December 27, 2020 7:51 am

The heat island effect in the city I live in is about 2C. I measured this consistently, sometimes daily. That ‘warming’ didn’t kill anybody, it’s largely beneficial. In fact, at this moment we would benefit greatly of some 15C of ‘global warming’ here. Or more, if possible.

Reply to  Hotscot
December 26, 2020 7:29 am

Better not let the snowbirds know or they’ll all wake up dead tomorrow

Reply to  Hotscot
December 26, 2020 10:06 am

Adaptation to global heating, results in the average person having to face the weather of whatever city is located 300 Km South of their present location…north in the southern hemisphere. You probably won’t even have to throw out a sweater ! But adapting your budget to the new carbon taxes might be demanding….

Reply to  DMacKenzie
December 26, 2020 6:06 pm

What carbon? The rate this is going, there won”t be any.

December 26, 2020 6:15 am

What a wonderful abstract, er…..abstraction! –

Phillip Bratby
December 26, 2020 6:23 am

Is it 1st April already?

Reply to  Phillip Bratby
December 26, 2020 10:57 am

Sure looks like it Phillip, but the paper is so obviously planned to yield the result expected it is a totally effort.
Computer programs only produce what is programmed into them. They openly admitted that the program was designed to produce the result.

Reply to  Phillip Bratby
December 26, 2020 6:07 pm

Climate models have only one date.

December 26, 2020 6:25 am

Here are falsifiable predictions for the coming decade. Universe is going to collapse in 2025, followed by Ice age in 2026, catastrophic global warming in 2027 and by the end of 2028 whole of the England’s Covid-19 infections will be tracked and trace and princess Nut-Nuts will be elected as the PM of England & Wales. .

Gregory Woods
Reply to  Vuk
December 26, 2020 9:45 am

Suggested addition to WUWT: A Doomsday calendar keeping track of all the events leading to our certain demise….

Reply to  Vuk
December 26, 2020 10:04 am

Is that you David Suzuki?

Phil's Dad
Reply to  Vuk
December 26, 2020 10:32 am

You scenarios were credible until you said track and trace will be fixed in just eight years. I can no longer take you seriously.

Ed Zuiderwijk
December 26, 2020 6:29 am

‘The linearity of the forced response’.

That explains it, they believe that nonsense. Never heard of logarithms.

Ian W
Reply to  Ed Zuiderwijk
December 26, 2020 7:21 am

‘The linearity of the forced response’

Never heard of coupled non-linear chaotic systems either

Jean Parisot
Reply to  Ian W
December 26, 2020 8:35 am

When the math gets too hard, its best to ignore it.

Greg Shark
Reply to  Jean Parisot
December 28, 2020 1:32 am

when it doubt leave it out! or double it ….

Last edited 30 days ago by Greg Shark
Reply to  Ian W
December 26, 2020 6:11 pm

What they say makes it a fact! See how easy that was? Beam me up, Scotty.

Reply to  Ed Zuiderwijk
December 26, 2020 8:22 am

The T^4 relationship to W/m^2 dictated by the Stefan-Boltzmann LAW doesn’t seem to matter either.

The bogus claim of approximate linearity between T and W/m^2 around the mean climate response has its poisonous tentacles reaching everywhere. This assumption is the preeminent failure of IPCC climate science that by ignoring the requirements of physics, both exaggerates warming trends as it minimizes cooling trends. Without this assumption, the meme collapses.

Reply to  co2isnotevil
December 26, 2020 8:39 am

Their models are far more in error than the difference between T^4 and linear over the range in question. You let them off lightly if you think it’s that.

They are rigged ( “tuned” ) from the word go. Simply dozens of poorly constrained parameters are tuned and tweaked to get a result they want to see. If it looks right, it is right, so they just end up modelling their expectations and/or agenda, not the climate.

Reply to  Greg
December 26, 2020 8:48 am

Yes, there are many more errors than false linearity, but many of these can be traced back to this primordial assumption. One reason is that when you ignore T^4, you need to add all sorts of heuristic fudge factors, each of which offers an opportunity to push results in a desired direction.

The only demonstrable linearity in the system is between W/m^2 and other W/m^2 which of course, is a prerequisite of COE. It’s almost like alarmists fail to understant that 1 Watt is 1 Joule per second and that COE applies to Joules.

Reply to  Greg
December 26, 2020 6:13 pm

Yes, the Swamp extends to the universities, too!

David Kamakaris
December 26, 2020 6:31 am

Our new approach to projecting the Earth’s temperature is based on historical climate data, rather than the theoretical relationships that are imperfectly captured by the GCMs.”

Excuse you, but historical climate data shows the Earth’s temperature to be much warmer throughout most of the Holocene than it is today.

Tom Abbott
Reply to  David Kamakaris
December 26, 2020 6:28 pm

If they used actual “historical climate data”, the type that is written down, and is unmodified by computer manipulation, then they would see there is no need to fear CO2 because it was just as warm in the Early Twentieth Century as it is today, even though CO2 concentrations have increased steadily since the Early Twentieth Century. More CO2 in the atmosphere, yet it is no warmer now than when there was much less CO2 in the atmosphere. Therefore, CO2 has little effect on the Earth’s temperature.

See how simple that was. I just used historical climate data (regional surface temperature charts) to reach those conclusions. It doesn’t need any computer manipulation. Just the actual data will suffice. It was just as warm in the recent past as it is today, yet there is more CO2 in the atmosphere now, than then, which means CO2 has no measureable effect on the Earth’s atmosphere or weather.

The reason the Climate Alarmists don’t use the actual data is because it blows up their catastrophic CO2 narrative.

And when these guys say they are using the historical climate data, I imagine they are referring to the bastardized, modern-era Hockey Stick charts,

Here’s a hint in case you didn’t know, but the Hockey Stick charts are really science fiction, and bare no resemblance to reality. If you are basing your work on this being accurate then you are wasting your, and our time.

You can’t look at historical temperture data and believe in Human-caused Climate Change. The historical temperature data refutes the Human-caused Climate Change meme.

Reply to  David Kamakaris
December 27, 2020 1:07 am

Many upvotes.

One doesn’t even have to go back very far in time. Between 1940 and 1980 there was a substantial global cooling, at a time when CO2 emissions were growing rapidly. This alone falsifies the central hypothesis of the Warmunists.

Steve Case
December 26, 2020 6:37 am

“Source: McGill University
The threshold for dangerous global warming will likely be…”

From my file of quoted, factoids and smart remarks:

Somewhere in an environmental science department at some cruddy university not far from you, a bunch of otherwise unemployable climate science graduates are working on yet another paper demonstrating that global warming is a really serious problem which can only be solved if millions of dollars in funding grants are chucked at it. James Delingpole

Reply to  Steve Case
December 26, 2020 6:16 pm

James should know better–most “climate scientists” are in the geography departments.

December 26, 2020 6:43 am

“….stochasticity of the internal variability, and the linearity of the forced response….”
But of course.  

Joel O'Bryan
Reply to  Dennis Topczewski
December 26, 2020 7:10 am

They also invented the Heisenberg Compensator.
Beam me up Scotty!!

All that obfuscating babble is to simply say, “We pulled out some graph paper and a ruler, and using y=mx+b, we drew some lines out starting from 1910 to 2100. The slope, m, of the lines were pulled from CMIP5 RCP’s, which themselves were made-up gibberish.

Further they assume the arbitrary 1.5ºC level means something since everyone keeps using it. But no one knows why it’s 1.5ºC, and not 1.6ºC, or 2.5ºC, or 1.4ºC. The 1.5ºC is just an arbitrary number that has morphed into a superstition-like cultural belief that something bad happens at that point. This is Cargo-Cult Science writ large, in Trillion dollar figures.

Reply to  Joel O'Bryan
December 26, 2020 9:40 am

goodness gracious, that was some TreknoBabble, I could visualize the author wearing an old-style carburetor air filter around his forehead whilst writing that

Phil's Dad
Reply to  Joel O'Bryan
December 26, 2020 10:42 am

Could I suggest the arbitrary 1.5ºC was spun at Paris when they realised we would probably come in under 2ºC on business-as-usual – a danger to the plans of the green profiteers.

Joel O'Bryan
Reply to  Phil's Dad
December 26, 2020 9:17 pm

30 years ago, 3ºC was the danger point. Then 20 years ago it morphed to a 2ºC danger point because 3º was too far off for the Pols paying the climate scam bills for no return.
Then starting around 10 years ago, well into the Hiatus (pause, etc), the Danger Point became 1.5ºC out of political necessity so the Pols could proclaim the Danger, and thus Crisis, was imminent.

Reply to  Joel O'Bryan
December 26, 2020 6:18 pm

…as long as the Great Reset Initiative accepts it, they’re good to go. What their critics say matters little to nothing.

Rich T.
December 26, 2020 6:50 am

We will find any means necessary to continue the crisis! We will not be stopped. We will control the world. The plan for WORLD Domination of the western world continues CCP will love us.

Ian W
Reply to  Rich T.
December 26, 2020 7:32 am

Don’t knock it Rich it’s working.

Biden is being urged to declare a “climate emergency” which appears to mean de-industrialize the USA and let China take over all manufacturing for the no-longer-free world.

All these weak papers will be quoted as hundreds of dire predictions from climate ‘scientists’.

December 26, 2020 6:52 am

Well now, they have a “new approach” that will give us all the answers this time! What could possibly go wrong?


Reply to  PaulH
December 26, 2020 7:24 am

Begs the question ‘why is there a need for a new approach if the science is settled’?

Oh hold on, I think I can guess…..

Gerald Machnee
December 26, 2020 7:18 am

I stopped reading at the blah, blah, blah.

December 26, 2020 7:19 am

I’ve long-since given up on these ‘studies’. They’re done to bolster claims of ‘catastrophe’ and keep the funding flowing.
No catastrophe = no funding and an end to the fake ‘crisis’. And we can’t have that.

Rick C
December 26, 2020 7:29 am

equilibrium climate sensitivity as: 1.7+0.3−0.21.7−0.2+0.3 K and 2.4+1.3−0.62.4−0.6+1.3 K respectively (likely range).”

How is a number with two decimal points interpreted? My computer says it’s an error. Who am I to argue? This was not covered in the classes I took to get a BS in math. Anyway, I ignore anyone who claims to be able to ‘more accurately predict the future.

Reply to  Rick C
December 26, 2020 6:21 pm

…they will claim that your BS isn’t what you think it is.

Alastair Brickell
Reply to  Rick C
December 27, 2020 12:36 pm

No no, it’s been peer reviewed. The problem is with you, not the equation. Be careful, they’re opening a Chinese style reeducation camp near you soon.

December 26, 2020 7:33 am

Can we have it now? Snowing and blowing a hooly here.

Jean Parisot
December 26, 2020 7:54 am

Does someone have cancer? They usually put their silly doomsday calls outside of their own lifetime or at least professional life.

Phil's Dad
Reply to  Jean Parisot
December 26, 2020 10:45 am

If this is the quality of their work it probably will be outside their professional life.

Reply to  Jean Parisot
December 26, 2020 2:08 pm

The problem is the total UNACCOUNTABLY of any of the climate nonce’s making these predictions.

There are no career consequences of being totally and completely wrong..

.. in fact, it seems that being totally and absolutely wrong in “Climate Science” is more a feather in the cap.

Just making the prediction, get you your next career points, even when it never occurs.

Reply to  fred250
December 26, 2020 6:24 pm

…the seriousness of the charge is way more important than anything else.

Reply to  fred250
December 27, 2020 1:12 am

They know that, by the time their idiotic predictions have been falsified, they will have reaped the benefits in terms of professional advancement, grants and pensions.

December 26, 2020 8:02 am

Just curious, but how is this “prediction” different from prior predictions?
Good old Bayes. The prior probability of climate disaster predictions is extremely low and thus would take extraordinary proof.

Hans Erren
December 26, 2020 8:20 am

Amazing that they stil are using RCP 8.5, and considering that ECS has a relaxation time of at least four centuries for 2xco2. Equilibrium sensitivity is completely meaningless for policimakers nkw and in the the coming decades.

TCR and ECS timescales

Hans Erren
Reply to  Hans Erren
December 26, 2020 8:25 am

Bottom line: a transient climate response of 1.7+0.3−0.2 is not dangerous.

Reply to  Hans Erren
December 26, 2020 11:15 am

RCP 8.5 was developed as an unlikely, far-out upper bound for human behavior. The report that contained it specifically said it was unrealistic and not intended as an actual possible state.
So get rid of it in research. The world is not going to continue for a century burning more and more oil and coal without limit, everywhereon earth.

Pat from kerbob
December 26, 2020 8:23 am

Hmmmm, they state that their method removes previous massive uncertainties?

There was massive uncertainty?
I thought the whole point was that there wasn’t massive uncertainty?

Reply to  Pat from kerbob
December 26, 2020 3:18 pm

This is just another “model” with all the inherent “climate scienceᴸᴼᴸ” fudge factors.

It is one model, and has a range less than the whole Chimp5 ensemble

Whoopy-doo !!

So full of erroneous, unscientific assumptions, as to be just as worthless as the models from 5 or 6 chimps.

December 26, 2020 8:36 am

Sounds like they’re running short on Gov. funding so we need more scary climate stories, “OH NO its worse than we thought ” Santa has come and gone,
now it’s time for Chicken Little…..

December 26, 2020 8:36 am

“Climate skeptics have argued that global warming projections are unreliable because they depend on faulty supercomputer models. While these criticisms are unwarranted”

Any thinking person knows that criticism of climate models is warranted owing to the extremely large range of predictions. Add to that the fact that 95% of the models have overpredicted temperatures during the last decade and you know that these climate models are not useful. Period. Anyone who claims that criticism is not valid simply cannot be trusted.

December 26, 2020 8:46 am

 1.7+0.3−0.21.7−0.2+0.3 K and 2.4+1.3−0.62.4−0.6+1.3 K

What on earth was that before it went through copy and paste ?

Reply to  Greg
December 26, 2020 6:27 pm

…probably not much difference.

Rainer Bensch
Reply to  Greg
December 27, 2020 3:47 am

A space was clobbered in the middle of 21 and 62?

December 26, 2020 8:54 am

OMG, more damned potty Potsdammers .

Neither 1.5 or 2.0 is defined as “dangerous”. These arbitrary political targets where supposed to be limits below which we could be fairly confident warming was safe.

This is not a black/white safe/”dangerous” choice which flips at 2.01 deg C.

It is a deliberate misrepresentation to redefine 2.0 as the beginning of “dangerous” warming. That is not what the IPCC says.

John Shotsky
December 26, 2020 9:01 am

We have global warming every year. It’s called ‘summer’. These ‘scientists must have missed it.

Reply to  John Shotsky
December 26, 2020 10:07 am

Well, semi-global warming at least every year.
(pedants rule, ok)

Reply to  Mr.
December 26, 2020 10:23 am

Obviously these stories of summer are a myth, since it doesn’t happen all over the planet simultaneously.

Reply to  MarkW
December 26, 2020 6:29 pm

Yeah, it’s just a local thingy.

December 26, 2020 9:12 am

Another study basing itself on the “CO2 warming-amplified-by-water-vapor” meme
The temperature of the planet is controlled by the water cycle, and predominantly CLOUD cover. Top of troposphere, CO2 of 400 ppm now, vs 280 pre-1850, (H2O less than 20 ppm at TOT) actually cools the TOT. At surface, where H2O can be 20,000 ppm on a humid day, 400 ppm is irrelevant. Middle elevations of Troposphere where H2O and CO2 are about equal are where some post 1850 warming occurs. But all that really does is raise the elevation at which CLOUDS form by a couple of hundred meters. And IF the mid-Trop ‘warmth’ works its way to surface via a presumed linear lapse rate, then more surface water evaporates, resulting in more area of clouds to reflect incoming sunlight. CO2 is so nearly inconsequential in the water cycle……you can probably expect ECS values to be reduced to around 1/3 of their present guesstimates in the near future.

Last edited 1 month ago by DMacKenzie
Reply to  DMacKenzie
December 26, 2020 10:21 am

Whadya mean ?!…..I’m not allowed to vote for my own comment ! I liked it.

Tom Abbott
Reply to  DMacKenzie
December 26, 2020 6:58 pm

Don’t worry, I just up voted twice, so one will make up for you not being able to vote for yourself. 🙂

Yes, I said I voted twice. Unless someone else voted simultaneously, my vote caused the counter to increase by 2. I would say that has happened six or seven times, since the software upgrade and a couple of times three votes were added.

David A
Reply to  Tom Abbott
December 28, 2020 1:51 am

Well Tom, the election went that way as well…

Reply to  DMacKenzie
December 26, 2020 6:31 pm

Yeah, who needs clouds when they can’t be modeled?

(I up-voted for you.)

Steven Curtis Lohr
December 26, 2020 9:35 am

Sounds like the previously visited and revisited hind casting idea. That coupled with some more mumbo jumbo, voila, another stupid paper. I try to take these seriously and read for comprehension, but then I get the feeling that comprehension is not what was intended by the authors. It falls into the very broad category of “fire for effect” approach. Just keep up the noise and someone might think you are the real deal. But, not.

Reply to  Steven Curtis Lohr
December 26, 2020 6:33 pm

The cardinal rule is, no publish, no grants. It was never about science.

December 26, 2020 9:54 am

And the $$ path to Bruno(McGill) leads to?

Gerald Machnee
December 26, 2020 9:55 am

My ECS is still 0.0 + or – 1.0

December 26, 2020 10:18 am

By using “historical records”, aren’t they assuming that all the warming so far, has been caused by CO2?

Chris Hanley
Reply to  MarkW
December 26, 2020 1:48 pm

Exactly, they used HadCRUT4 GISSTEMP NOAA + BEST that are not independent nor reliable data sets anyway.
As usual their reasoning is circular, historically the climate has changed at the same rate with zero anthropogenic ‘forcing’.
Post hoc ergo propter hoc.

Reply to  MarkW
December 26, 2020 2:12 pm

If they are using say GISS as “historical records” of temperatures, they are wrong from the very start

Just another case of GIGO !

Reply to  MarkW
December 26, 2020 6:34 pm

The good news is that they’re stll sentient. That’s all.

December 26, 2020 10:20 am

Oh, for Pete’s sake!!! When are they going to stop playing this broken violin?????

The oxygen content of this planet’s atmosphere is 20%.

The CO2 content of this planet’s atmosphere is – wait for it – 0.04%. A four-hundredth of a percent CO2 and we’re gonna crash and burn????????????? What are they really afraid of? that it might rise to 0.042%???? Or is it that grant money they think they’re going to miss out on getting?

Give me a confounded break, willya?

Reply to  Sara
December 26, 2020 6:36 pm

Maybe they think CO2 can still burn!
Hey, these aren’t chemists!

Gordon A. Dressler
December 26, 2020 10:25 am

Of course, the above article’s quoted extracts from the McGill University publication make not mention of the paper by Wijngaarden and Happer ( ) documenting how the science of radiation physics amongst the constituents of Earth’s atmosphere—when performed in detail and accurately—show that CO2’s greenhouse gas effect is currently ESSENTIALLY SATURATED and thus any additional CO2 emissions (whether from natural or man-made sources) cannot possibly drive additional global warming.

IMHO, as regards ECS from a scientific basis, stick a fork in it, its done.

Tom Abbott
Reply to  Gordon A. Dressler
December 26, 2020 7:04 pm

“the science of radiation physics amongst the constituents of Earth’s atmosphere—when performed in detail and accurately—show that CO2’s greenhouse gas effect is currently ESSENTIALLY SATURATED and thus any additional CO2 emissions (whether from natural or man-made sources) cannot possibly drive additional global warming.”

And this saturation would also apply to past atmospheric temperatures.

John F Hultquist
December 26, 2020 10:29 am

The more scienceey it sounds, the wronger it is.
This one dials up to 11.

Gunga Din
December 26, 2020 10:34 am

<blockquote>Study: Dangerous Global Warming Could Occur by 2027</blockquote>
Well, since the “97% Scientific Consensus of (pick a year)” had said “Dangerous Global Warming” would have already occurred by (pick a year) and we’ve done more than just survive all those past dangers, I’m not worried.(It helps that I have a snow-blower now.8-)

Gunga Din
Reply to  Gunga Din
December 26, 2020 4:30 pm

Looks like to old, “manual” blockquote method doesn’t work anymore.
Time to mess around on the “Test” page!

Reply to  Gunga Din
December 26, 2020 6:38 pm

Just hit the Edit button and fix it.

Robert of Texas
December 26, 2020 11:13 am

Wait a minute – I thought they said the world was ending around 2030-2031? Who cares what the climate does after the world ends?

They really do not understand that the climate is going to change no matter what just as it always has. Man-kind can have an impact on climate kind of like a tiny radio signal riding on a carrier waver. CO2 is a bit player; water is a much more important player.

Until someone figures out why and how the climate actually changes there is no hope in making any serious predictions. They will never make any scientific progress until they breakout of the “CO2 controls everything” box.

Reply to  Robert of Texas
December 26, 2020 6:41 pm

They have figured it out: it’s a chaotic system, which pretty much removes any control knobs. Or if I put on my Climate Scientist hat, I could be totally wrong but I don’t care. 😏

H. D. Hoese
December 26, 2020 11:31 am

You don’t need much physics, like none, to see the contradiction in the abstract.
“An aerosol scaling factor and a non-linear volcanic damping exponent were introduced to account for the large uncertainty in these forcings…… The key uncertainty is due to aerosol forcings;…..”  And then we have to obey reductions in order to take care of uncertainty?

Reply to  H. D. Hoese
December 26, 2020 6:43 pm

They play baseball with just home plate.

High Treason
December 26, 2020 12:02 pm

The entire fantasy of doom and gloom is based on sophistry. Each step exaggerates the previous assumptions until the entire scenario is a massive fantasy. The motive for the big fallacious fantasy?- a tax on air )lots and lots of $$$$$$$$$$) and being able to collapse our energy based civilization. Those that control the technology we are forbidden from using will have total power over us.
Anyone who still believes the hyperventilating catastrophists needs to step back, take a couple of deep breaths, read the childhood fables of Chicken Little, the boy who cried wolf, the Emperor’s New Clothes and the man, the boy and the donkey. These tales are warnings about adults being sucked in by mass deception.

December 26, 2020 12:05 pm

What determine global climatic temperature is the heat content of the Earth’s ocean.
Earth’s ocean heat content is very low, in comparison to Earth’s history.
Earth has been in an Ice Age for millions of years, and in the last 1/2 million years, it has been coldest.
In this Ice Age we spend most of the time in glaciation periods, and have shorter time periods of time in interglacial periods. We are still in a interglacial period, and there is high degree of uncertainty of when Earth will be entering a glaciation period.
There are wild claims that a glaciation period will delayed as much as 75,000 years, due to human activity {CO2 emission} but nobody claims that we will not re-enter a glaciation period. I suspect humans will become a spacefaring civilization and will be able to choose whether we enter a glaciation period or not- I tend to imagine we might at that time decide we want to be in a glaciation period, but will modify it’s effects upon all life including humans.
Anyhow, we don’t know if or how much higher levels of global CO2 will effect global average temperature.
There seems to be growing consensus, that more than 90% of global warming is warming our cold ocean. I think it’s more like, 99% of global warming is warming our ocean.
It been long said, that average temperature of entire ocean is about 3.5 C.
It’s also said that Earth average global air temperature is about 15 C.
Both 3.5 C number and 15 C number are guesses.
Since ocean water is saltwater, large amounts ocean water can below 0 C and during the millions of years of our Ice Age the temperature of entire ocean has had average temperature within range of 1 to 5 C. And since we in coldest part of this Ice Age it’s unlikely ocean temperature will reach 5 C.
But were the ocean to warm by .5 C, this could have dramatic effect, and such dramatic effects could similar to global climatic condition in the earlier part of our present interglacial period and/or similar to warmer period in past interglacial periods.
Though if ocean cooled by .5 C, that would very bad effects for our current human civilization.
During the Little Ice Age, the ocean cooled by some fraction of .5 C and in our recovery from LIA, the ocean warmed by some faction of .5 C.
It seems to me that over last 5000 years the ocean has been cooling- though it’s commonly accepted more 5000 years ago, Earth had warmer conditions. And this large period of time was called the Holocene Climate Optimum. Wiki:

Why we fear returning conditions which are called optimum, begs question related
to human sanity. It certainty would be better for farming- which people have long thought as important.

David A
Reply to  gbaikie
December 28, 2020 2:02 am

Good comments. The oceans are a G.H.L. (Greenhouse Liquid.). And the residence time of energy entering the oceans is vastly greater and more variable then the tiny residence time variable of CO2.

December 26, 2020 12:09 pm

To bad to wait ’til 2027
Southern Germany/ Bavaria and Alp region down to -25°C (drop from -7°C to -25°C within 11 h)
Northern Finland around -40°C
Siberia is waiting for around -50°C
Let the warming come NOW !

Last edited 1 month ago by Krishna Gans
December 26, 2020 1:10 pm



The problem with making such short term forecasts is when they fail to materialize, the cause is discredited.

But then again, they’ve been making such failing predictions for decades, yet they get stronger in the public mind.

Reply to  Art
December 26, 2020 3:24 pm

“the cause is discredited.”

In climate science, it doesn’t matter if a prediction turns out to be totally wrong.

It is the MAKING of the prediction that gains you career credence.

Being WRONG in “climate scienceᴸᴼᴸ” is a FEATURE, rather than an inconvenience.

December 26, 2020 1:24 pm

First thoughts reading using a mobile device.

1. Yet another it’s worse than we thought paper.

2.The IPCC Billions were wasted on faulty model compared to this one. (;-)

3. Complex non linear differential simultaneous equations can be simulated by y=mx+c (huge uncredited tip to Dr Pat Frank, oft the target of Gavin Schmidt’s defence of current GCM models on that score and note no attempt to look at the forward error propagation envelope)

4. We only need 10 years to observe this prediction, unlike the last 40 years of the blind leading the blind. In fact probably 5 will be enough for observations to diverge from these predictions.

5. TCS ECS are confirmed in the lower bounds of the IPCC models. – No argument there.

6. “Dangerous warming” is still a pseudo scientific emotive activist scare tactic use of language.

7.Admission of “guestimation” of paramaters as near enough is good enough.

8. After 40 years the old bogey man aerosols are still used as an excuse for errors. God give us a break!

9. My advice is read to over the break for comic relief.

Link is here.

December 26, 2020 2:29 pm

Finally, a date by which all the prognosticators won’t be dead so we can move them when it doesn’t happen.

Reply to  bluecat57
December 26, 2020 3:28 pm

Sorry, but being WRONG is an essential for advancement in the field of “climate scienceᴸᴼᴸ”

They will move on to higher paying climate prediction jobs.

Chris Hanley
December 26, 2020 2:39 pm

Without assumptions about ‘forcings’ etc., this is a simple plot of the supposed global temperature as a function of the supposed and measured (post 1957) CO2 concentration:
Further discussion here:

William Haas
December 26, 2020 3:17 pm

But the reality is that there is no real evidence that CO2 affects climate. Clearly there is no such evidence in the paleoclimate record. There is also plenty of scientific rationale to support the conclusion that the climate sensitivity of CO2 is zero. Apparently what they are doing is not based in reality.

December 26, 2020 3:30 pm

These Climate scientists don’t even go outside now and feel the weather , total reliance on computer models feed with low resolution data . They don’t seem to even see the climate today , for instance , ALL of Russia is below zero, well below , North Eastern Russia , an area twice the size of Europe is at least -30oC and many parts are -40oC . Northern Spain , half of France , most of Germany are below zero. All of Japan , Korea (both) , Tibet ,half of China etc etc all below zero and most well below . The North Pole -27oC , central Greenland -35oC , Canada ,Alaska well below zero over vast areas. Hudson bay already frozen solid and the earliest freeze up in the last 20 years , Polar bears are thriving ! Winters in the Northern Hemisphere seem overall to be getting colder , larger areas freezing , and a little earlier every year . When is Global warming going to show itself ? I thought it was meant to be first evident in winter with higher temperatures ? But look at area freezing now and it still is December . January to mid February is to come yet ,when the real freeze sets in . Even Central Antarctica over an area nearly 3/4 the size of Australia it is currently an average of -30oC , even New Zealand today 27/12/2020 ,mid summer ,midday average temperature 12-14 oC after a very cold night. And Antarctic sea ice over winter was slightly above the average and the Arctic Sea Ice is a little below average but about the same as it has been for the last 5 years . Where is the global warming we are meant to fear ?

December 26, 2020 4:02 pm

2027 is also the year china is supposed to become worlds largest economy.


Reply to  Dmacleo
December 26, 2020 5:12 pm

Will probably happen much earlier than that..

The USA will go backwards, FAST, under a Biden/Harris global-socialist muppet government.

That is the plan, anyway !

Tim Gorman
December 26, 2020 4:09 pm

“In a study for Climate Dynamics, the researchers introduced the new Scaling Climate Response Function (SCRF) model to project the Earth’s temperature to 2100″

MODEL? Once again it’s models all the way down! I fail to see how this model is any more accurate than any other model. With a +/- 0.5C uncertainty in every historical measurement, the result from any model using iterative techniques will have an uncertainty FAR GREATER than a 1.5C to 4.5C interval. In other words, the projection of this model is no better than the projection of any other model. I can’t find even one mention of the uncertainty associated with the historical temperature record, not a single one.

Flight Level
December 26, 2020 7:23 pm

No kidding ? No more winter operations ? Wow, worth waiting .

December 26, 2020 8:42 pm

So we’re back to being doomed, then?

Patrick MJD
December 26, 2020 10:08 pm

A case of old models bad, new models good? So, more rubbish!

Antero Ollila
December 26, 2020 11:10 pm

This new approach is based on historical climate data for calculating climate sensitivity (TCS or ECS). If you do so, you include all the possible climate driving forces like total solar irradiance changes and not only carbon dioxide changes. An excessively big error in methodology. The results have no scientific reliability.

Mr. Lee
December 27, 2020 3:28 am

I looked at the paper, and the methodology didn’t make sense to me. They used historical data to get probability distributions for parameters of impulse-response functions. At first glance, this seems to be a bit of a stretch. I’m not “calling b.s.”, but I’m not convinced that the process makes sense. They can get probability distribution for parameters of global climate response to aerosols? Seriously?

December 27, 2020 6:54 am

I could model my breakfast coffee, but I put greater faith in the real thing. One of my learned friends said:
“These people live in a virtual world – they believe their models more than they believe real observations!”

The ability to predict is the best objective means of assessing scientific competence, and the global warming alarmists have NO predictive track record – actually a 100 NEGATIVE predictive track record and thus 100% NEGATIVE SCIENTIFIC CREDIBILITY – the warmist cabal have been wrong about everything, so nobody should believe these climate fraudsters – about anything!

“MacRae’s Maxim”:

The Great Global Warming Fraud is a litmus test for basic intelligence – if you believe is catastrophic human-made global warming (aka “climate change”) hysteria, then you are an unscientific dolt, and no useful knowledge can be imparted to you.

The Great Global Warming Fraud has no place in polite, intellectual company – it is a scary politicized fiction, concocted by wolves to stampede the sheep. It is not real – be comforted by this fact.

December 28, 2020 8:48 pm

“actually a 100% NEGATIVE predictive track record and thus 100% NEGATIVE SCIENTIFIC CREDIBILITY”

Mickey Reno
December 27, 2020 6:59 am

I’m glad to hear that the authors think these goofy models of the transient and equilibrium sensitivities must be compared against real-world data. So from now on, I declare that it’s necessary to track at least ONE cycle of glaciation and inter-glacial periods in order to be considered a valid representative sample. This means a data sample of around 100K years, instead of 30 years. That ought to just about do it. Government officials and scientists funded by government will not be allowed to use the term “unprecedented” unless one, but preferably two or more entire 100K year periods have never seen a phenomenon. Scientists yakking about unprecedented phenomena in the Great Lakes, for example, would need to speculate on how they behaved when covered by 2000 meters of ice sheet, or indeed, were formed by the internal dynamics of that ice. So much stupidity would grind to a halt if we required a true representative sample prior to making any climate pronouncements.

very old white guy
December 27, 2020 7:10 am

I wish the place would just burn up and then we will get on with our lives. Think about it.

December 27, 2020 11:34 am

This is one of my favorite blogs. Do u have a podcast? If not do it!

December 27, 2020 2:22 pm

You mean the poli sci of the next election has already begun?

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