Issues & Insights Is Right: If Modern Warming Is Driven By Fossil Fuel Use, It Prevented an Ice Age

From ClimateREALISM

By Linnea Lueken

Issues & Insights (I&I) describes a new study which claimed that human burning of fossil fuels may have prevented an ice age, and suggests that, if it’s true, then modern warming should be celebrated. This perspective makes sense considering the dangers of glacial periods, and because human life struggled in past cold periods like the Little Ice Age. Meanwhile, amid the past century of modest warming, human life has flourished.

The post, “Study Finds ‘Climate Change’ Stopped The Next Ice Age — Why Aren’t We Celebrating?” describes the study and points out how mainstream media alarmists are already trying to do damage control.

The study was published in Science, under the title “Late Holocene reexpansion of the Laurentide Ice Sheet.” It directly asked the question of whether “anthropogenic” or human-caused global warming prevented a new glacial cycle which would have thrust the planet into tens of thousands of years of cold. The researchers focused on the extent of the Laurentide Ice Sheet, noting that it began to grow again about 2,000 years ago, with suggests that a cooling period was setting in. After the 1960s, the trend reversed, which the Editor’s Summary says is “evidence that humans caused the termination of the next glaciation.”

I&I points out that long term geologic history “shows that ice ages are a recurring phenomenon that last far longer than “interglacial” periods like the one we are in right now (80,000 years vs. 10,000 years, roughly). And global temperatures during previous interglacial periods were far higher than today’s “hottest year on record.”

The chart they reference is reposted below.

I&I goes on to point out that scientists are very aware that another ice age would lead to the shrinkage of land area that could be used for crops, and could lead to mass starvation.

They’re spot on in that assessment, and it doesn’t even take a full, thousands-of-years-long ice age to do so.

As discussed in a Climate Realism post from last year, “Human extinction is a baseless climate scare, Slate,” the Little Ice Age, which lasted from about 1300 to the 1850s, saw widespread disease and famine. This was the time of the bubonic plague in Europe. Across the Atlantic, shortly before Europeans showed up in Mesoamerica, cold weather and drought decimated the Aztecs’ maize crops and led to famine. Cold weather led to multiple crop failures across Ireland in 1740, for example, killing almost a million people by starvation. Then, because of short growing seasons and cold weather which potatoes tolerate better than other staple crops, the Irish became very dependent on them. When potato blight struck in 1845, it led to another severe famine, known today as the Great Famine or Potato Famine.

Granted, technology was very limited in the Little Ice Age, humanity has come a long way with regards to agricultural techniques and equipment, as well as things like greenhouses and artificial lighting that were not available before. It’s reasonable to expect that, if we were to enter another ice age, humans would adapt, just as we adapt to other bad weather conditions.

Still, history shows that cooling isn’t good for crop production. Warming, more atmospheric carbon dioxide for plant food, and recent gains in precipitation are, though, as demonstrated alongside technological innovation. Staple crops such as cereals (rice, wheat, rye, oats, barley, millet, and maize) have seen an increase in yield of over 52 percent since just 1990, and a 60 percent increase in overall production. The most recent all-time production and yield record occurred in 2023, according to United Nations Food and Agriculture Organization data, which goes to 2024. (See figure below)

While I&I did not explicitly point to these data, they ask a very good question, assuming that human emissions of carbon dioxide are primarily responsible for averting the ice age: “Shouldn’t this be cause for celebration? And shouldn’t we be encouraging everyone to keep burning as much fossil fuel as possible for as long as possible?”

One would think it would be good news for the media to report on, but, adding an update to the story, I&I notes that “as we suspected, this new study is being dismissed. Here’s CNN’s headline from Oct. 29: “Humans accidentally canceled the next ice age — but it’s no reason to celebrate, scientists say“”

The mainstream media is not interested in honestly reporting on good news, it must all be spun into alarmism. If human activity was causing cooling, that would also be called catastrophic, although in that case they might be more correct.

Regardless of whether human use of oil, gas, and coal are primarily responsible for modern warming, there is no doubt that it is better than what appears to be the alternative, plunging into thousands of years of global cold.

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November 6, 2026 2:28 pm

I don’t know how much credibility we can give this study, but the media reaction is absolutely priceless.

“Human activity may have delayed an ice age: that’s nothing to celebrate.”

Fair enough. Let’s try a few other things.

“Human activity has succeeded to stop a global Red Death pandemic (Thank you, Dr. Edgar Poe!): that’s nothing to celebrate.”

“Human activity may have prevented an asteroid from hitting the Earth: that’s nothing to celebrate.”

“Humanity has succeeded in finding a vaccine against death: that’s nothing to celebrate.”

Do readers of these media outlets never feel insulted by such utter nonsense?

Reply to  Charles Armand
November 6, 2026 5:49 pm

Yes! It’s too early to say if humans have staved off another inhospitable glacial period, or if we’re responsible at all. Probably should let our progenitors thousands or tens of thousands of years from now make that determination when there’s more certainty. Earth and its climate cycles play a very long game, measured in millenia and (much) longer.

Phillip Chalmers
Reply to  stinkerp
November 6, 2026 11:09 pm

and the titanically powerful activity possessed by people, human, several thousand years ago was WHAT?
Magic? Sun worship? Christianity? … ?
Horsepower use, like, real horses?

alastairgray29yahoocom
Reply to  Charles Armand
November 7, 2026 11:53 am

Well considering how much of global agriculture is depended on aquifers charged during glacial periods maybe we are in need of a general recharge of natural systems. The same is true of soil nutrients, and possibly cold and adversity might trigger a new and better phase in human evolution . Bring it on and let the fittest survive. The alternative seems to be run everything down and let a UN or WEF bureaucracy decide who thrives and who dies

gyan1
November 6, 2026 3:10 pm

There’s zero evidence CO2 has ever been a primary driver of climate. There’s unequivocable evidence humans can be easily manipulated by propaganda. The brainwashed can’t comprehend the modest warming to date could be beneficial due to their profound ignorance of empirical reality. Media will keep them in the fold.

Michael Flynn
Reply to  gyan1
November 6, 2026 3:45 pm

But . . . but . . .

Svante Arrhenius, whose unsupported speculations are quoted as basis for CO2 induced “global warming” (he’s allowed to be totally wrong on this occasion), said that increased CO2 –

would make cold regions of the Earth warmer and “more equable,” protecting future generations from the return of deadly ice ages and glaciers

at least according to the American Geophysical Union.

Oh well, AGU, journalists – equally ignorant and gullible.

Reply to  Michael Flynn
November 6, 2026 7:48 pm

Regarding Arrhenius, he did everything in his power to prevent Dmitri Mendeleev from receiving the Nobel Prize in Chemistry. Mendeleev had been highly critical of Arrhenius’s work on electrolytic dissociation, which had earned him the Nobel Prize in Chemistry in 1903. Ultimately, Arrhenius was right, but Mendeleev had nevertheless made some interesting contributions to the debate. Given Arrhenius’s considerable influence within the Swedish Academy of Sciences, he managed to ensure that Mendeleev did not receive the Nobel Prize in 1906. Instead, it was a Frenchman, Henri Moissan, who received the award for his discovery of fluorine (he also invented the electric arc furnace).
In retrospect, I find this episode quite revealing.

Considering the lobbying Arrhenius undertook to prevent Mendeleev from receiving this prestigious distinction, there is a certain irony in the fact that Arrhenius, drawing on the work of Tyndall and Fourier, is credited with discovering the role of CO2 as a greenhouse gas. This is particularly striking when one considers how many personal relationships have been destroyed over disagreements surrounding the “climate crisis” supposedly caused by the addition of carbon dioxide to the atmosphere.

Reply to  Charles Armand
November 7, 2026 1:07 pm

For all his pioneering work on the Periodic Table, Mendeleev never accepted the reality of the electron in Chemistry, which is ironic because the PT exists because of the properties of electrons.

Phillip Chalmers
Reply to  Graemethecat
November 7, 2026 4:31 pm

FFS, the periodic table exists because of the real nucleus composition of the real elements in the real world, the PROTON number.
The classifications at the left and right depend on the power of the PROTON number overwhelming the outer shell electron stability, very acid or vary basic.
The others not so much. Neutron/proton ratios determine nucleus stability throughout and the outer-shell electrons almost disappear in chemical property relevance in two series in the lower middle, the lanthanoid and actinoid series.

Phillip Chalmers
Reply to  gyan1
November 6, 2026 11:19 pm

When the solar system is considered and earth is looked at as just one of the planets, Sol 3, the presence and nature of the atmosphere of each one plays a significant part in the conditions on the solid surface, if it has one.
A bare rock Sol 3, in what we now call the Goldilocks Zone, is calculated to be too cold for water to exist as ice, liquid and vapour.
It is ALL the gases, nitrogen as well as oxygen with the tiny traces of other things COMBINED has set a baseline above and below which the earth grows warmer and cooler under the influence of the amount of solar energy which falls on the conical surface facing the sun and the speed of rotation taking that patch of warmed surface, less than one third of the total surface, away from the direct radiant heat.
Forget talking about modern analogies from the glassy walled garden sheds, think blanket around your chest and belly with naked legs, head and arms and shoulders.
So, while Sol 3 IS in the Goldilocks Zone and IS spinning and wobbling and orbiting the sun it has a surface temperature suitable for a vast number of carbon based life forms which thrive in a wide variety of zones of different composition and temperatures and humidity compatible with its gross composition of land, ocean and ice.

Michael Flynn
November 6, 2026 3:39 pm

The planet doesn’t miraculously heat up and cool down all by itself, unless physical laws as presently known are complete rubbish.

Local glaciation occurs – Antarctica is one fairly recent occurrence, with fossil evidence of abundant flora and fauna until the ice came. Mind you, nobody knows whether Antarctica was originally somewhere else a long way away.

On the other hand, arid deserts sometimes replace greenery, probably due to increased heat – maybe the heat almost balances the cold, with slow but inexorable cooling of the planet as a whole.

In any case, anybody who thinks that adding CO2 to air makes thermometers hotter is simply delusional. It doesn’t. Try it, if you don’t believe me. Bursting into tears won’t help.

November 6, 2026 3:41 pm

As facts of geological record, the present earth ice ages likely started with the tectonic close of the Panama Isthmus about 2.3 Mya. Drastically altered ocean near surface currents the most likely culprit. Former Princeton geologist Duffies wrote an entire book about it.

For the first about 1.3 my, the periodicy was about 45 ky. Then about 1 mya, the periodicy shifted to about 120 ky, roughly 100k ice age and 20k interim interglacial. Nobody knows why, just that it did. The most recent interglacial interlude, the Eemian, lasted exactly about that long.

These intervals are all geologically established by sea level low/high stands, supported by much sketchier oceanographic proxies. ( Between peak glacial lowstand, and peak interglacial highstand after the longer periodicy, sea level varies by about 450 feet, or over 150 meters. These are easily discerned geologically.

So the claim that the present interglacial was beneficially prolonged 100 years by climate change is scientifically absurd. As is the claim of anthropogenic warming last half century.

Phillip Chalmers
Reply to  Rud Istvan
November 6, 2026 11:40 pm

you have given a particular example amongst many possible ones for the change in one mechanism of energy redistribution.

It prompts me to frame an assertion – scientific analysis of the mechanisms of changes in the total retained energy of the earth are properly focussed on the mechanisms my which the planet is COOLED.
The energy increase comes in AT THE SPEED OF LIGHT, the energy shedding rate alters, because it is dependent upon the result of the combination of all the mechanisms by which the incoming energy is transported by convection, radiation and conduction slowly and then radiated out into space at ALL wavelengths. (Visible spectrum plus ultra and infra radiations)

Phillip Chalmers
Reply to  Phillip Chalmers
November 7, 2026 4:49 pm

just two scientifically illiterate votes, eh?
Prove that the energy ENTRY rate is ALTERED by any process in any of the planets – there is data of Mars changing at the same time and under the same solar system changes.
All the incoming energy comes in at the speed of light but the amount coming in varies with the distance of the planet from the sun due to the elliptical shape of the orbits, sometimes much closer to the fire and sometimes as far from the fire as gravity permits. The fire also flares and goes quieter.
The energy shedding, getting rid of the solar energy which has entered into the oceans, the land and the atmosphere depends on the mechanisms which use fluids to transport it towards the poles and up to the troposphere.

Boff Doff
November 6, 2026 4:17 pm

There is no money in truth,

November 6, 2026 4:25 pm

The circle finally closes. What a journey WUWT has been on.

It started out with, ‘There is no warming – there is cooling!’

The next progression was, ‘There is warming but it is natural!’

Finally, we reach, ‘There is warming and it is man-made… but it is good for us!’

The next progression is the final and fatal one.

As the bard said:

“Nae man can tether time or tide...”

Reply to  TheFinalNail
November 6, 2026 6:28 pm

As usual, a load of confused, inaccurate, deficient and inconsequential dribbling from the master of defective ideas.

‘There is no warming – there is cooling!’

very few if anyone says that. If there is someone, it’s quite pathetic to zero in on them and tar the whole website with the same brush. – Pathetic and simple.

There is warming but it is natural!’

No. Most people here claim that the evidence that warming is natural is as strong or stronger than the reverse. You are pathetic and very simple.

There is warming and it is man-made… but it is good for us!’

No one can claim the warming is man made and only a complete fool (such as yourself) would claim it.
The warming is good for us. All the measurable metrics demonstrate that.

You have embarrassingly proved yet again just how shallow your thought processes are.

Anthony Banton
Reply to  Mike
November 6, 2026 10:58 pm

“No. Most people here claim that the evidence that warming is natural is as strong or stronger than the reverse. You are pathetic and very simple.”

OK: Can I ask you to do that very thing?
(provide this “strong or stronger” evidence)
Without an ad hom.

Phillip Chalmers
Reply to  Anthony Banton
November 6, 2026 11:57 pm

the onus, the culture of science, is on the proponent of a new theory is to PROVE their guess using evidence.
AGW was the new guess, NO evidence yet in 40 years is convincing the disinterested and well-informed people that the guess is true.
It will go down in history as a mass delusion believed by consensus such as “bad smells are the cause of infectious disease” or “cutting off the tails of a long tailed animal will make their species become a short tailed animal”.
We now know about germs and genes. Do you dispute them?

Anthony Banton
Reply to  Phillip Chalmers
November 7, 2026 12:25 am

Sorry, but not accepting that get-out.
Just another hand-wave away without supporting evidence.
(a repeat of what Mike did).
It may float your boat but if the climate science community did likewise I suspect you would not approve.

Mike said : “No. Most people here claim that the evidence that warming is natural is as strong or stronger than the reverse. You are pathetic and very simple.”

That is a pretty dogmatic *denial* of climate science, (not to say insulting), and to ask for the presentation of such “strong or stronger” evidence rather than his handwaving allusion to it is precisely how science should be conducted – by the production of published research and peer-review.

I would then of course bring counter evidence.

Bryan A
Reply to  Anthony Banton
November 7, 2026 6:54 am

See my response below for one very important and highly measured metric on beneficial warming!

Bryan A
Reply to  Anthony Banton
November 7, 2026 6:51 am

Moved

MarkW
Reply to  Anthony Banton
November 7, 2026 8:22 am

Science.
The historical record.
The fact that in the recent past (last 20,000 years) it has been much warmer than the present, without the advantage of enhanced CO2.

Reply to  Mike
November 7, 2026 3:46 pm

‘There is no warming – there is cooling!’

very few if anyone says that.

As I said, it “started” with that here at WUWT. Look back to the early days of this site and you will find numerous examples of posts predicting imminent global cooling.

Read through the history of this site and you will see the progression from flat-out denial of warming, to reluctant acceptance (but not on the cause), to, “Ok, it’s warming and it’s us – but that’s a good thing!”

Phillip Chalmers
Reply to  TheFinalNail
November 6, 2026 11:50 pm

What garbage, name any contributor here or in the past who is guilty of the actual assertion that the climate of planet earth does NOT change.
Like, CLIMATE DENIAL. It is as stupid, as juvenile, as idiotic as saying “ya muvvers a prozzy” in a school-yard.
JOURNALIST, POLITICIANS, LOBBYISTS, INFLUENCERS and “I’m one of the in-crowd cool kids”

Bryan A
Reply to  TheFinalNail
November 7, 2026 6:50 am

Yes, the Minimal warming since even 1960 has been beneficial especially to Food Supplies

Key Trends & Growth (1960–Present)

Massive Output Surge: Total global food and crop production has increased by roughly 390% since 1960, and world agricultural output nearly quadrupled between 1961 and 2020.Minimal Land Expansion: This massive leap in harvest occurred with only a modest 10% increase in land use, meaning farmers produced drastically more food per acre through higher yields.Staple Crop Surges: Major crops experienced explosive growth between 1961 and 2022, supplying about 80% more calories per person globally. Standout examples include:Soybeans: Output surged by roughly 1,300%Maize (Corn): Output increased by about 560%Rice: Output rose by about 300%
Not only increased warmth but also increased CO2 concentration had contributed to this growth and production miracle.

Reply to  TheFinalNail
November 7, 2026 7:44 am

I suppose you never noticed that many viewpoints and claims are presented and actively discussed here. It does not necessarily follow that any represent a point in a “journey”.

The elements you offer are all part of a consistent position. It has warmed and cooled repeatedly on all timescales with no help from humans. There is no evidence that human emissions of carbon dioxide are more than a small, if any, component of the recent changes observed, and that fossil fuel use and the resulting emissions (and the modest warming, whatever its cause) do not represent a crisis and are, in fact, overwhelmingly beneficial.

The real point of the article is to display the bias of the media in its presentation of what it calls “news”. It basically demonstrates that IF (big IF) the study were valid in its conclusions, your alarmist cult would still insist on a message of doom.

Reply to  Mark Whitney
November 7, 2026 3:49 pm

I suppose you never noticed that many viewpoints and claims are presented and actively discussed here. It does not necessarily follow that any represent a point in a “journey”.

It’s a journey alright. One forced by reality, not by choice.

MarkW
Reply to  TheFinalNail
November 7, 2026 8:20 am

Speculating about the nonsense being published by the climate catastrophists is in no way an endorsement of those wacky theories.

Like most catastrophists, you couldn’t think your way out of a wet paper bag.

Reply to  MarkW
November 7, 2026 4:00 pm

Speculating about the nonsense being published by the climate catastrophists is in no way an endorsement of those wacky theories.

You mean “catastrophists” like David Archibald, who was featured heavily here in the early days, claiming that the northern hemisphere was about to experience, “… twelve and a half years of cooling from mid-2013…”, “… ending in 2026.”

Is that one of the ‘catastrophists’ you are referring to? It was certainly a wacky theory.

(For anyone interested, the Northern Hemisphere warmed at a rate of +0.6C per decade sine mid-2013, if UAH is to be believed.)

Reply to  TheFinalNail
November 7, 2026 2:48 pm

Think the actual journey has been from arguing about the climate and the evidence for CAGW to gradually coming to realize that this isn’t the real issue. The real issue is energy policy.

The alarmists are in the position of declaring an imaginary emergency, but then proposing policies which, even if they are right about the emergency, are both impossible to implement, unaffordable even if possible, and useless even if possible and affordable.

Useless because, even if the alarmists theories are right, they will have no effect on the supposed problem. Migrate electricity generation to wind, and so what? Can’t be done. Move ICE to EV and wind can’t fuel them. And what about all the other sources of emissions, what about the 75% of the world that has no intention of doing anything but growing their emissions as fast as economic growth requires?

Its like claiming that the earth is going to be eaten by a giant green turtle. And then demanding we all stand on our heads every morning. Even if you are right about the turtle, nothing you have said shows that standing on our heads will affect it one way or the other, and anyway, 99% of the world has no intention of doing it regardless..

Reply to  michel
November 7, 2026 4:04 pm

It’s a bit simpler than all that stuff about green turtles.

Nations simply transition away from fossil fuels and towards renewables as their primary energy supply.

The world has been doing it very effectively and at decreasing expense for decades now, despite the best efforts of the fossil fuel industry, aided and abetted by sites like this, to prevent that from happening.

November 6, 2026 4:35 pm

What a shock… conservturds don’t care about the environment.

Jeff Alberts
Reply to  Eldrosion
November 7, 2026 7:47 am

Apparently you would prefer that Canada, Northern Europe and Asia, cease to exist, under a mile of ice, and the rest of the world starve due to agricultural collapse the world over. Turd indeed.

MarkW
Reply to  Jeff Alberts
November 7, 2026 8:32 am

I had one liberal tell me that if a huge asteroid, that was capable of wiping out all life on the planet was heading towards the earth, he would oppose doing anything to stop it. The reason, the asteroid was just nature in action so it was good. Stopping it was by definition un-natural and therefor bad.

Reply to  Eldrosion
November 7, 2026 7:49 am

Chuckle. That wins the award for the Mindless Comment of the Day. It rescues Final Nail from that dubious distinction.

MarkW
Reply to  Eldrosion
November 7, 2026 8:30 am

And yet another example of hatred towards those who fail to worship the socialist party.
It’s also another example of the self centeredness of leftwing thought.
In this case the assumption that only those that agree with it, care about whatever.

Reply to  MarkW
November 7, 2026 8:59 am

It is my experience that people who make such declarations have very little understanding of “the environment” and generally make no real contribution to its conservation. It is simply a matter of saying they care, and as you point out, denigrating anyone who does not follow the party line.
That is the difference between “environmentalists” and true conservationists.

Edward Katz
November 6, 2026 4:57 pm

Naturally the mainstream media would downplay, ignore, or put a negative spin on such news or theories largely because much of their funding instructs them to do so. But just wait for any type of weather event that has a negative impact on the human or wildlife population or agriculture or the food supply and those same news outlets would be guaranteed to equate it with human induced climate change caused naturally by excessive fossil fuel use. All of which is the reason not to trust such claims unless one examines both sides of the story.

November 6, 2026 4:59 pm

Harold The Organic Chemists Say:
“CO2 Does Not Cause Warming Of Air”!
At the MLO in Hawaii, the concentration of CO2 in dry air is currently 426 ppm. One cubic meter of this air has a mass of 1,290 grams and contains a mere 0.84 grams of CO2 at STP. This small amount of CO2 cannot absorb enough out-going long wavelength IR light to warmup such a large mass of air. We need to inform the people that there is only a trace amount of CO2 in the atmosphere.

Activities of humans cannot any significant “global warming” because most of them live in poverty. Activities of humans in urban areas can cause local warming and climate change due to the urban heat island effect.

Phillip Chalmers
Reply to  Harold Pierce
November 7, 2026 12:00 am

Harold is known to keep banging on about his crazy ideas whenever he finds a group talking amongst themselves and that regardless of whether he is drunk, stoned or sober.

Jeff Alberts
Reply to  Phillip Chalmers
November 7, 2026 7:48 am

At least he stopped “assisting” us with his vast knowledge of the Internet.

MarkW
Reply to  Phillip Chalmers
November 7, 2026 8:34 am

“banging on about his crazy ideas”

The irony abounds.

Victor
Reply to  Harold Pierce
November 7, 2026 5:00 am

Water vapor captures the largest proportion of LWIR.
This graph illustrates the relationship between water vapor and CO2.
comment image

November 6, 2026 7:56 pm

I must say that the article’s fact-checking approach detracts from its relevance. The fact is that we have no idea what could have been done to prevent an ice age if there had actually been a probability of one occurring. Nor is there any reason to give this study greater credibility a priori than other studies. Nothing indicates that we are facing an environmental crisis caused by the use of fossil fuels. There are real problems we should be addressing, such as reducing pollution, putting an end to overfishing wherever it occurs, and so on. These obvious points are frequently reiterated in ClimateRealism publications.

It is precisely because such issues are tangible that they can be fact-checked, unlike the subject matter addressed in this article.

Jeff Alberts
Reply to  Charles Armand
November 7, 2026 7:49 am

We’re in an ice age, it has already occurred.

Phillip Chalmers
November 6, 2026 11:05 pm

To me, this is simply more worthless speculation.

D Sandberg
November 6, 2026 11:07 pm

Nice to have a chuckle reading something that’s just as ridiculous in the other direction as the catastrophic existential warming threat nonsense.

Everyone agrees atmospheric CO₂ is rising. Everyone agrees nature is currently a net sink. The central debate is therefore not whether uptake occurs, but how long it can continue increasing and at what rate. Understanding that timescale may tell us more about the future of atmospheric CO₂ than another round of attribution statistics.

The key question is not whether natural sinks exist. The key question is whether they are closer to the beginning of their response to the perturbation, or closer to the end of it.

Victor
Reply to  D Sandberg
November 7, 2026 4:36 am

The sea surface temperature anomaly has increased by 0.3°C from June to the present date this year.
comment image
The surface air temperature anomaly has increased by 0.7°C from June to the present date this year.
This proves that sea surface temperature drives the surface air temperature.
Solar radiation drives sea surface temperature.

Robert Watt
November 7, 2026 1:44 am

This is what one AI system thinks:
Is it impossible for the Earth to enter a new Ice Age as long as CO2 remains at or above 250 ppm?

Yes, according to current paleoclimate modeling, it is virtually impossible for the Earth to enter a new glacial period (ice age) as long as atmospheric \(\text{CO}_{2}\) remains at or above 250 ppm. [1, 2]

The 240 ppm Threshold
Geological history shows that for the past 800,000 years, Earth’s climate has alternated between cold glacial periods and warm interglacials driven by Milankovitch cycles (wobbles in Earth’s orbit and tilt). However, these orbital shifts only provide the initial nudge. Greenhouse gases act as the primary amplifier. [1, 2, 3, 4]
Research led by climate scientists at institutions like the University of Cambridge and the Potsdam Institute for Climate Impact Research indicates that a “glacial inception” (the start of a new ice age) requires a specific mathematical combination of low summer solar radiation and low greenhouse gases. [1, 2, 3]

  • Models show that atmospheric \(\text{CO}_{2}\) must fall below roughly 240 parts per million (ppm) for ice sheets to begin expanding.
  • During pre-industrial times, natural \(\text{CO}_{2}\) sat comfortably above this threshold at around 280 ppm.
  • Because of this, scientists calculate that Earth narrowly bypassed a natural ice age trigger a few thousand years ago simply due to a favorable orbital alignment and natural carbon levels. [1, 2, 3]

The Current Reality
With modern atmospheric \(\text{CO}_{2}\) concentrations surpassing 420 ppm due to fossil fuel emissions, the greenhouse effect completely overpowers the subtle cooling tendencies of Earth’s orbital cycles. [1, 2]
Even if all greenhouse gas emissions instantly ceased, the lifetime of carbon dioxide in the atmosphere is so prolonged that concentrations would remain well above the 240–250 ppm threshold for tens of thousands of years. Consequently, human activity has effectively postponed the next natural ice age by at least 50,000 to 100,000 years, if not suppressed the cycle indefinitely. [1, 2, 3]

If you want to dive deeper into this topic, let me know if you would like to explore:

  • How Milankovitch cycles alter solar energy distribution.
  • The risk of localized cooling shocks, such as a collapse of the Atlantic Meridional Overturning Circulation (AMOC), occurring independently of a global ice age.
  • How ancient carbon levels compare to today’s climate trajectory.

AI responses may include mistakes. Learn more

Bryan A
Reply to  Robert Watt
November 7, 2026 7:02 am

Not so sure about that.
It has been proven that Temperature increases lag Natural CO2 production by approx. 800 years. And that historic CO2 levels naturally reach between 280ppm and 300ppm. The Lag Time also indicates that dropping into a new glaciation period happens 800 years prior to CO2 dropping from the cooling. CO2 sinks faster in a cooling environment.

Jeff Alberts
Reply to  Bryan A
November 7, 2026 7:51 am

I think you meant to say that CO2 production lags temperature increases.

Bryan A
Reply to  Jeff Alberts
November 7, 2026 10:24 am

You are correct.

November 7, 2026 6:34 am

Does this mean these researchers know what causes ice ages, why they begin, and why they end?

Jeff Alberts
Reply to  Paul Hurley
November 7, 2026 7:51 am

It means they can pulls words straight out of their asses.

Jeff Alberts
November 7, 2026 8:59 am

It didn’t prevent an ice age, because we’re IN an ice age. Using the right terms is important. It may have prevented another glacial period, but none of us alive will ever know if that’s true.

November 7, 2026 2:12 pm

The radiative effect of warming attributed to GHE since 1850 is 1.6W/m2 in the 240W/m2 absorbed by the earth from the Sun and returned to space on a continuous basis. THis is simply irrrelevant within the scale of the Laskar cycles of the orbital effects on the changing energy received by the earth’s surface as a combined effect of the three main Milankovoitch cycles. The great summers and winters these cycles create have a sustained range of 100W/m2 over sustained periods of 1,000’s of years within the ~100 ka cyckes. People need to get a grasp of the scale of variability and periodicity before publishing junk, or commenting on it. Consider that, for a short interglacial to happen, the Norther Hemisphere must by directly facing the Sun due to precession at the Perihelion of maximim eccenticity, 23 Ka and!ooka in phase, so as close as the NH can physically get at maximum tilt twoards the Sun. THat’s a whole lot more than human can arrange. It doesn’t happen in the Southern hemisphere because that all oceans frpo40 S to the polar antarctice which is simply a land based oermanet ice sheet all the time, trying hard to get super cold.

Note the Laskar cycle variability in the blue line at the top of the graph from Ellis and Palmer .

Then play with the web tool and see how the three cycles in phase create the Doozy that was the Eemian (set slider on the Vostok chart to 126 ka BP and go through the cycles one at a time in islolation, then together). The Eemian removed much of the galcial ice from Greenland, there wer Hippos in the Thames and Rhine at 50 deg North, the sea livel probley rose 5m/15feet.

The Holocene is a runt interglacial, THIS (Eemian) is an interglacial. But it still needs that synchronicity to work up the radiative maximum of inpahse 23ka and 100ka cycles that melts the ice in Summer at a rate the winter cannot replace. IMO. And human effect’s are trivial. But only according to what we measure, not the climate “scientists”.

Ellis-and-Palmer-Fig-3
Reply to  Brian Catt
November 7, 2026 2:13 pm

Typos excepted….

Reply to  Brian Catt
November 7, 2026 2:14 pm

The Madison link to the cyclic analysis tool: https://cimss.ssec.wisc.edu/wxfest/Milankovitch/earthorbit.html