No, USA Today, ‘Day After Tomorrow’ AMOC Collapse Isn’t Happening

USA Today claims in “Infamous disaster scenario can rapidly unfold, study finds” that the Atlantic Meridional Overturning Circulation, or AMOC, could rapidly collapse in a scenario reminiscent of the movie The Day After Tomorrow. This is false. The article leans on cinematic fear imagery and speculative modeling rather than observational evidence, and it repackages long-debunked catastrophe narratives as breaking news.

From ClimateRealism


By Anthony Watts

USA Today claims in “Infamous disaster scenario can rapidly unfold, study finds” that the Atlantic Meridional Overturning Circulation, or AMOC, could rapidly collapse in a scenario reminiscent of the movie The Day After Tomorrow. This is false. The article leans on cinematic fear imagery and speculative modeling rather than observational evidence, and it repackages long-debunked catastrophe narratives as breaking news.

The piece explicitly invokes The Day After Tomorrow, writing that the film “imagined a world where a critical ocean current suddenly collapsed.” That comparison is not accidental. It is rhetorical framing designed to trigger anxiety. The glaring problem is that the movie’s premise has been scientifically debunked for years.

The film portrayed the AMOC collapsing in a matter of days, plunging the Northern Hemisphere into an instant ice age. Oceanographers and atmospheric scientists have repeatedly explained that such abrupt global glaciation is physically impossible under current planetary conditions.

The Day After Tomorrow’s depiction of an instantaneous AMOC collapse and rapid ice age was scientifically debunked by the National Oceanic and Atmospheric Administration (NOAA)  in 2004. NOAA stated that while the AMOC could weaken under climate change, the movie’s rapid, days-long shutdown and instant global freeze are physically impossible. NOAA explained that such changes would unfold over decades to centuries, not days.

NASA scientists also publicly criticized the movie’s premise. NASA climate scientist Gavin Schmidt wrote at RealClimate that the film’s portrayal of hemispheric flash-freezing and superstorms “is physically impossible” under known atmospheric and ocean dynamics.

The American Meteorological Society (AMS) similarly explained that while ocean circulation changes are scientifically plausible over long timescales, the movie’s depiction of continent-scale temperature drops occurring in days violates basic thermodynamics and atmospheric physics.

Additionally, oceanographer Stefan Rahmstorf, who studies the AMOC, stated that although weakening is possible over long periods, the rapid ice-age scenario shown in the film is not realistic.

In short, multiple authoritative scientific bodies and researchers made clear at the time of the film’s release that while AMOC variability is a legitimate research topic, the movie’s catastrophic timeline and mechanisms were exaggerated beyond physical plausibility.

Even the Intergovernmental Panel on Climate Change (IPCC) Sixth Assessment Report (AR6) states there is low confidence in an AMOC collapse before 2100. Yet Doyle Rice of USA Today points to the big-budget Hollywood disaster film to keep the catastrophic imagery alive.

Fear sells, but in the real-world physics matters.

The study highlighted by USA Today examines the Younger Dryas, a cooling event roughly 12,900 years ago, and suggests volcanic eruptions may have contributed to AMOC disruption. That paleoclimate research is not evidence that modern AMOC collapse is imminent or is made likely by human emissions of carbon dioxide.

The article admits that during the Younger Dryas there was evidence of “a weakening of the AMOC, but not a complete collapse.” The article also quotes a scientist saying the Younger Dryas shift was “a much more abrupt shift than what is currently happening.” Those admissions contradict immediacy of an AMOC collapse induced climate catastrophe implied in the headline. Weakening is not the same as collapse. Variability is not the same as shutdown.

Moreover, the Younger Dryas occurred under vastly different conditions. Ice sheets were far larger. Freshwater pulses from glacial lakes were massive. Orbital forcing differed the amount of sunlight received on Earth’s surface. Comparing that era to today is dishonest.

USA Today pivots from volcanic cooling thousands of years ago to modern carbon dioxide, asserting that today’s threat comes from “excess carbon dioxide in the atmosphere.” But that claim rests on climate model simulations projecting weakening under high emissions scenarios. It is not based on observational evidence of collapse.

Direct measurements of AMOC strength, such as the RAPID array at 26.5°N operating since 2004, show variability but no clear downward spiral toward shutdown. The system fluctuates on decadal timescales. It has throughout recorded history.

As summarized at Climate at a Glance’s review of ocean currents, claims of imminent AMOC collapse are not supported by consistent observational data. The page highlights that while some model projections show weakening under high emissions pathways, empirical measurements remain inconclusive and demonstrate substantial natural variability.

Climate Realism has likewise documented how concerning the AMOC there is no consensus. The scientific literature has gone three ways: collapse scenarios, steady-state projections, and partial strengthening, all depending on model configurations. That divergence alone signals high uncertainty. Ocean circulation depends on salinity gradients, wind forcing, freshwater input, and deep water formation processes that are imperfectly represented in even the most advanced models.

The AMOC is complex. It has fluctuated for millennia. It may weaken modestly over this century under certain emissions scenarios. That is not the same as a Hollywood-style catastrophe.

Referencing The Day After Tomorrow as scientific shorthand for disaster is dark storytelling not journalism. The movie was unrealistic when it was released. It remains unrealistic today. When media outlets use debunked cinematic imagery to frame uncertain model projections as looming disaster, they are misinforming and fearmongering their audiences. USA Today should be ashamed of itself for substituting a falsely alarming climate change narrative for the journalistic presentation of truth and knowledge about an important issue.

Trees Remember an Ice Age Solar Storm

More than 14 thousand years ago, there was a solar storm so big, trees still remember it. Dwarfing modern solar storms, the event would devastate technology if it happened again today. Spoiler alert: It could.

ChatGPT

From Spaceweather.com

By Dr.Tony Phillips

May 21, 2025: (Spaceweather.com) More than 14 thousand years ago, there was a solar storm so big, trees still remember it. Dwarfing modern solar storms, the event would devastate technology if it happened again today. Spoiler alert: It could.

Above: Subfossil trees along the banks of the Drouzet river in France [ref]

The record-strong storm is described by a paper in the upcoming July 2025 edition of the peer-reviewed journal Earth and Planetary Science Letters. It occured in 12,350 BC and is classified as a “Miyake Event.”

Miyake Events are solar storms that make the Carrington Event of 1859 look puny. Trees “remember” them in their rings, which store the carbon-14 created by gargantuan storms. At least six Miyake Events have been discovered and confirmed since Fusa Miyake found the first one in 2012. The list so far includes 664-663 BC, 774 AD, 993 AD, 5259 BC, 7176 BC, and 12,350 BC.

The Miyake Event of 12,350 BC is especially intriguing. It appears as a carbon-14 spike in Scots Pine trees along the banks of the Drouzet river in France, with a matching beryllium-10 spike in Greenland ice cores. The event was global and, based on the size of the spikes, very big.

At first, no one could say how big the storm was because it happened during the Ice Age.

Carbon-14 storage is complicated. When a solar storm creates carbon-14 in the upper atmosphere, the radioisotope doesn’t immediately appear in the woody flesh of trees. Getting there involves months to years of atmospheric circulation influenced by climate and geography, and even then the carbon-14 has to arrive during the tree’s growing season, otherwise it won’t be “taken up.” High-altitude trees are favored because they encounter the carbon-14 first, while different species each have their own sensitivity.

All these factors are a harder to tease out in the Ice Age. Most known Miyake Events occurred after the Ice Age, during the Holocene, a period of relatively stable and warm climate starting about 12,000 years ago. Climate scientists have atmospheric circulation models for the Holocene, so interpreting Miyake Events in 7176 BC, 5259 BC, 664-663 BC, 993 AD, 774 AD was relatively straightforward. Not so, the event of 12,350 BC.

To solve this problem, Kseniia Golubenko and Ilya Usoskin from the University of Oulu in Finland developed a chemistry-climate model (SOCOL:14C-Ex) specifically for Ice Age solar storms. It takes into account ice sheet boundaries, sea levels, and geomagnetic fields that existed during the Pleistocene’s Late Glacial period. Using this model, they were able to interpret tree ring data for 12,350 BC.

According to their paper, 12,350 BC is the biggest Miyake Event yet.  It produced a hailstorm of solar particles 500 times greater than the most intense solar particle storm recorded by modern satellites in 2005. During the 2005 event, an airline passenger flying over the poles might have received a year’s worth of sea-level cosmic radiation in just one hour. During the 12350 BC event, the same dose would have been received in a mere eight seconds.

This would seem to set a new standard for worst-case scenarios in space weather. However, the real news is deeper: The door to the Ice Age has been kicked open by SOCOL:14C-Ex. Older tree rings may now be interpreted with confidence, potentially revealing even worse storms.

Stay tuned for more news from the trees.

Gulf Stream Collapsing Again!

Yes, it’s that old bogeyman again!
Its “The Day After Tomorrow” all over again!

Atlantic Meridional Overturning Circulation (AMOC)

By Paul Homewood

Yes, it’s that old bogeyman again!

From the Mail:

The network of ocean currents which keep the Earth’s climate stable could be about to collapse, scientists have warned.

In an open letter, 44 of the world’s leading climate scientists say that key Atlantic Ocean currents – including the Gulf Stream – are on the brink of failure.

The scientists caution that the collapse of the Atlantic Meridional Overturning Circulation (AMOC) could lead to ‘devastating and irreversible impacts’ which will affect ‘the entire world for centuries to come’.

The resulting climate fallout could plunge the UK into a ‘new Ice Age’, with winter temperatures plummetting up to 15°C (27°F) below the current average.

While the collapse of the Gulf Stream would be disastrous for Britain, that vital current is just one small part of AMOC’s massive global system.

This giant ocean conveyor belt is critical for moving heat around the planet, but research suggests that it has been slowing down and could soon reach a tipping point.

Without urgent action, the scientists warn that AMOC could fail completely within the next few decades.

As warm water travels northwards from the tropics, it hits the sea ice around Greenland and the Nordic countries, cooling and becoming much saltier.

As the water cools it becomes denser, sinking rapidly towards the bottom of the ocean where it flows back southwards before once again warming and rising to the surface.

This process of ‘deep water formation’ is the engine for a vast global conveyor belt which pumps heat and water all around the Atlantic Ocean.

However, studies suggest that AMOC’s deep water engine has started to slow and is now showing worrying signs of breaking down altogether.

As global temperatures rise, melting ice pours fresh water back into oceans, diluting the denser salty water and preventing it from sinking.

If this process were to break down entirely, it would have catastrophic knock-on effects including the weakening of the Gulf Stream and the disruption of global weather patterns.

Its “The Day After Tomorrow” all over again!

As with a lot of climate scams, this one is based on just a few years data, from which the “scientists” conclude that they have identified cataclysmic changes that have not happened for millennia.

The Met Office give a more balanced summary:

https://www.metoffice.gov.uk/weather/learn-about/weather/oceans/amoc

Not this particular sentence:

Oceanographers have been measuring the AMOC continuously since 2004. The measurements have shown that the AMOC varies from year to year, and it is likely that these variations have an impact on the weather in the UK. However it is too early to say for sure whether there are any long term trends. Before 2004 the AMOC was only measured a few times,

So we only have data since 2004, and the year to year variations are large. To pretend that such a short series is in any way significant is not only unscientific but fraudulent.

This is what the series shows:

https://climexp.knmi.nl/getindices.cgi?WMO=NOCData/moc_mar_hc10_mon&STATION=AMOC_26N&TYPE=i&id=someone@somewhere&NPERYEAR=366

It would appear that there is little trend since around 2008.

The idea that the AMOC never changed before 2004 is absurd anyway.

Bob Dickson & Svein Østerhus laid out in their study, “One hundred years in the Norwegian Sea”, the major climatic changes in the Norwegian Sea and the rest of the Arctic:

All were associated with changes in Atlantic currents and the AMOC. The Warming in the North, for instance, occurred because of the influx of warm Atlantic seawater, in exactly the same way as with recent Arctic warming. As the Met Office explain, warm water evaporates leaving saltier water, which sinks because it is more dense. Saltier water of course freezes at lower temperatures, so Arctic sea ice tends to contract. (Note when it freezes, the salt tends to leech out, so either way the sea becomes saltier).

The Great Salinity Anomaly which followed the Warming was the result of that influx of warmer water retreating, in part because of northerly airflow :

http://www.tandfonline.com/doi/pdf/10.1080/00291950701409256

These weather patterns are part and parcel of the Arctic Oscillation, another perfectly natural cycle. The anomalously higher pressure over Greenland marks the time of the negative AO:

From NSIDC:

https://nsidc.org/cryosphere/icelights/2012/02/arctic-oscillation-winter-storms-and-sea-ice

As fresh, polar water replaced warmer Atlantic water, salinity levels fell – hence the name given to the event. Just as Arctic sea ice had retreated during the Warming, it expanded rapidly during this period. The GSA was not just a phenomenon in the Norwegian Sea, because the polar gyre carried this fresh water around the whole of the Arctic Ocean.

Another factor identified by Dickson and Osterhus in the freshening of the Arctic Ocean is increasing discharge from Eurasian rivers into the basin. A warming climate means a wetter climate in those regions. And more river discharge leads to more sea ice and a colder Arctic.

In other words, these processes tend to be self correcting. Milder weather leads eventually to more sea ice and a colder climate, until eventually the AO flips back to positive again.

I’ll leave the final comment to Dickson & Osterhus:

All these changes were the result of natural processes. There is no evidence that these will change in future.

Climate Fact-Check September 2024 Edition

Guest Post by: The Competitive Enterprise Institute, The Heartland Institute, the Energy & Environmental Legal Institute, the Committee for a Constructive Tomorrow, and the International Climate Science Coalition, and Truth in Energy and Climate.

Editor’s note: This summary serves as a fact check on the biggest false claims made in the media in September, 2024.

From ClimateRealism

By Steve Milloy

Guest Post by: The Competitive Enterprise Institute, The Heartland Institute, the Energy & Environmental Legal Institute, the Committee for a Constructive Tomorrow, and the International Climate Science Coalition, and Truth in Energy and Climate.

Editor’s note: This summary serves as a fact check on the biggest false claims made in the media in September, 2024. 

We’re taking a break this month from the tiresome comparison of NASA satellite data with real-time surface stations reporting to bring you this graph (OK, it’s our straight red line) from the Washington Post:

As you can plainly see, the supposed “global temperature” has been cooling for 485 million years. But you may be thinking, are global temperatures from that far back really credible? Here’s the answer: As there is no such physical thing as “global temperature,” all guesstimates of such an imaginary thing are equally valid. And now that we have solved the alleged climate crisis, let’s move on to this month’s fact checks.

Links: The Washington Post article, link about Helene intensification, Get more information.

Links: The Associated Press article, Get more information.

Links: News-Medical post, Get more information.

Links: The Vancouver Sun article, The Washington Post article.

Links: The Washington Post article, Get more information.

Links: The Washington Post article, CNN article, Get more details.

Links: The Washington Post article, Get more information.

Links: The Washington Post article, Get more information.

Links: The New York Times article, Get more information.

Links: The Washington Post article, U.S. fish and Wildlife Service comments.

To close out this month, let’s go back to the Washington Post graph focusing on
the most recent period shown in the inset. The recent warming did not begin with the advent of coal-fired power plants, SUVs and cheeseburgers. It began 20,000 years ago, which is about 15,000 years before recorded human history. Until next month, check out these and more fact checks at:

ClimateRealism.com

WattsUpWithThat.com

See you in November for the October Climate Fact Check!

Originally posted at JunkScience.com, reposted with permission.

The Sahara Desert used to be a green savannah – new research explains why

Algeria’s Tassili N’Ajjer plateau is Africa’s largest national park. Among its vast sandstone formations is perhaps the world’s largest art museum. Over 15,000 etchings and paintings are exhibited there, some as much as 11,000 years old according to scientific dating techniques, representing a unique ethnological and climatological record of the region.

The-‘Eye-of-Sahara-by-ESA-3

 From The Conversation

By Edward Armstrong

Algeria’s Tassili N’Ajjer plateau is Africa’s largest national park. Among its vast sandstone formations is perhaps the world’s largest art museum. Over 15,000 etchings and paintings are exhibited there, some as much as 11,000 years old according to scientific dating techniques, representing a unique ethnological and climatological record of the region.

Curiously, however, these images do not depict the arid, barren landscape that is present in the Tassili N’Ajjer today. Instead, they portray a vibrant savannah inhabited by elephants, giraffes, rhinos and hippos. This rock art is an important record of the past environmental conditions that prevailed in the Sahara, the world’s largest hot desert.

These images depict a period approximately 6,000-11,000 years ago called the Green Sahara or North African Humid Period. There is widespread climatological evidence that during this period the Sahara supported wooded savannah ecosystems and numerous rivers and lakes in what are now Libya, Niger, Chad and Mali.

This greening of the Sahara didn’t happen once. Using marine and lake sediments, scientists have identified over 230 of these greenings occurring about every 21,000 years over the past eight million years. These greening events provided vegetated corridors which influenced species’ distribution and evolution, including the out-of-Africa migrations of ancient humans.

These dramatic greenings would have required a large-scale reorganisation of the atmospheric system to bring rains to this hyper arid region. But most climate models haven’t been able to simulate how dramatic these events were.

As a team of climate modellers and anthropologists, we have overcome this obstacle. We developed a climate model that more accurately simulates atmospheric circulation over the Sahara and the impacts of vegetation on rainfall.

We identified why north Africa greened approximately every 21,000 years over the past eight million years. It was caused by changes in the Earth’s orbital precession – the slight wobbling of the planet while rotating. This moves the Northern Hemisphere closer to the sun during the summer months.

Africa’s vegetation cycles. Author provided (no reuse)

This caused warmer summers in the Northern Hemisphere, and warmer air is able to hold more moisture. This intensified the strength of the West African Monsoon system and shifted the African rainbelt northwards. This increased Saharan rainfall, resulting in the spread of savannah and wooded grassland across the desert from the tropics to the Mediterranean, providing a vast habitat for plants and animals.

Our results demonstrate the sensitivity of the Sahara Desert to changes in past climate. They explain how this sensitivity affects rainfall across north Africa. This is important for understanding the implications of present-day climate change (driven by human activities). Warmer temperatures in the future may also enhance monsoon strength, with both local and global impacts.

Earth’s changing orbit

The fact that the wetter periods in north Africa have recurred every 21,000 years or so is a big clue about what causes them: variations in Earth’s orbit. Due to gravitational influences from the moon and other planets in our solar system, the orbit of the Earth around the sun is not constant. It has cyclic variations on multi-thousand year timescales. These orbital cycles are termed Milankovitch cycles; they influence the amount of energy the Earth receives from the sun.

On 100,000-year cycles, the shape of Earth’s orbit (or eccentricity) shifts between circular and oval, and on 41,000 year cycles the tilt of Earth’s axis varies (termed obliquity). Eccentricity and obliquity cycles are responsible for driving the ice ages of the past 2.4 million years.

The third Milankovitch cycle is precession. This concerns Earth’s wobble on its axis, which varies on a 21,000 year timescale. The similarity between the precession cycle and the timing of the humid periods indicates that precession is their dominant driver. Precession influences seasonal contrasts, increasing them in one hemisphere and reducing them in another. During warmer Northern Hemisphere summers, a consequent increase in north African summer rainfall would have initiated a humid phase, resulting in the spread of vegetation across the region.

Eccentricity and the ice sheets

In our study we also identified that the humid periods did not occur during the ice ages, when large glacial ice sheets covered much of the polar regions. This is because these vast ice sheets cooled the atmosphere. The cooling countered the influence of precession and suppressed the expansion of the African monsoon system.

The ice ages are driven by the eccentricity cycle, which determines how circular Earth’s orbit is around the sun. So our findings show that eccentricity indirectly influences the magnitude of the humid periods via its influence on the ice sheets. This highlights, for the first time, a major connection between these distant high latitude and tropical regions.

The Sahara acts as a gate. It controls the dispersal of species between north and sub-Saharan Africa, and in and out of the continent. The gate was open when the Sahara was green and closed when deserts prevailed. Our results reveal the sensitivity of this gate to Earth’s orbit around the sun. They also show that high latitude ice sheets may have restricted the dispersal of species during the glacial periods of the last 800,000 years.

The Sahara desert. Getty Images

Our ability to model the African humid periods helps us understand the alternation of humid and arid phases. This had major consequences for the dispersal and evolution of species, including humans, within and out of Africa. Furthermore, it provides a tool for understanding future greening in response to climate change and its environmental impact.

Refined models may, in the future, be able to identify how climate warming will influence rainfall and vegetation in the Sahara region, and the wider implications for society.