New Study Proves Earth Warmer than Today During the Medieval Era
For years, climate activists and their allies in the scientific community have attempted to downplay—or outright deny—the existence of the Medieval Warm Period (MWP), a significant global climatic era roughly 1,000 years ago.
Their motivation is clear: if the world was demonstrably warmer a millennium ago, before the industrial revolution and its “carbon emissions,” then the entire premise of man-made catastrophic climate change becomes highly suspect.
As a seasoned science writer I have spent the past 15 years sharing the hard evidence exposing globalist climate lies peddled by alarmist politicians, media hacks and self-serving grifters.
Michael Mann, Katherine Hayhoe Erasing the Medieval Warm Period
But the science they don’t want you to see shows 1,200 Papers Affirm Medieval Warm Period Was Global
image above: from the first UN IPCC Report showing the MWP as much warmer than today
The above graph never appeared again in any official UN publications. It was quietly removed. Also not shown, for example, was the earliest documented vineyards in England that were noted in the Domesday Book of 1087, primarily located in the southern regions and a few in the north with reports of vineyards and wine making in Yorkshire – inconceivable in our cooler, modern times.
Now, a new study published in the reputable journal Communications Earth and Environment delivers a devastating blow to those who doubt the MWP . Researchers have uncovered incontrovertible physical proof that the MWP was not only real, but it was also a global phenomenon, warming even the most stable and frigid region on Earth: the Antarctic continent.
A Meltwater Carving in an “Eternal” Glacier
The study, led by an international team including Emanuele Forte of the University of Trieste and Mauro Guglielmin of the University of Insubria, focused on the Boulder Clay Glacier in Victoria Land, East Antarctica . This region is supposed to be one of the most stable environments on the planet, having been frozen solid for approximately 14 million years . Yet, by using Ground Penetrating Radar (GPR) and drilling four boreholes, the researchers made a startling discovery.
They found a massive glacial unconformity—a distinct break in the ice stratigraphy—marked by a continuous sediment layer and a dramatic erosion channel . This channel, more than 4 kilometers long, was carved by intense meltwater flow that, at the time, was powerful enough to cut deep into the glacier’s surface . Today, this area is permanently snow-covered and shows no sign of surface melting, highlighting the extraordinary nature of this medieval event .
Radiocarbon Dating: The Smoking Gun
The clinching piece of evidence came from the depths of the ice. At 11.11 meters below the surface, the team found leafy mosses suitable for radiocarbon dating. The results were definitive: the moss was 1,050 calibrated years old, placing it squarely in the middle of the Medieval Warm Period, between 900 and 989 years before the present .
This is not a proxy record that requires questionable interpretation; this is physical, biological proof. Moss grew, meltwater flowed, and a landscape transformation occurred in a region where that is supposedly impossible today.
A Natural Climate Fluctuation of Immense Power
The researchers noted that this event was “extraordinary” and the result of a “natural climatic fluctuation” . This is a key point that skeptics have been making for decades. The planet has experienced periods of significant warming that were not caused by human activity.
In fact, the scientific evidence shows Most Of Earth’s Past Has Been Much Warmer Than Today
The discovery of an ancient, 4-kilometer-long meltwater channel in the heart of the Antarctic ice sheet demonstrates that natural climate variability is far more powerful and dynamic than the current narrative of man-made dominance suggests.
It is not heat we need to worry about, but cold. Why Worry about Warming? Cold is the Killer
The research, published in April 2025, further underscores that the evidence for a warmer natural past continues to mount against the dogmatic claims of climate alarmism . This evidence fundamentally challenges the alarmist assertion that today’s warming is unprecedented, unique, or primarily the result of human activity.
Anyone who bothers to do their own research knows earth’s climate is always changing and that warming and cooling cycles are natural and explainable and not due to human emissions of carbon dioxide.
Apply the Null Hypothesis to Man-made Global Warming!
The world was warmer just 1,000 years ago, and the ice itself is now telling us that story. Check out our vast library of science articles and learn more about the MWP. https://principia-scientific.com/page/3/?s=medieval+warm+period
About the author: John O’Sullivan is CEO and co-founder (with Dr Tim Ball among 45 scientists) of Principia Scientific International (PSI). He is a seasoned science writer, retired teacher and legal analyst who assisted skeptic climatologist Dr Ball in defeating UN climate expert, Michael ‘hockey stick’ Mann in the multi-million-dollar ‘science trial of the century‘. From 2010 O’Sullivan led the original ‘Slayers’ group of scientists who compiled the book ‘Slaying the Sky Dragon: Death of the Greenhouse Gas Theory’ debunking alarmist lies about carbon dioxide plus their follow-up climate book. His most recent publication, ‘Slaying the Virus and Vaccine Dragon’ broadens PSI’s critiques of mainstream medical group think and junk science.
References
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Forte, E., Azzaro, M., Cannone, N., Longhi, A., Santin, I., & Guglielmin, M. (2025). A warming pulse in the Antarctic continent changed the landscape during the Middle Ages. Communications Earth & Environment, 6(1), 281. https://doi.org/10.1038/s43247-025-02259-4
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Forte, E., Azzaro, M., Cannone, N., Longhi, A., Santin, I., & Guglielmin, M. (2025). A warming pulse in the Antarctic continent changed the landscape during the Middle Ages. Communications Earth & Environment, 6(1), 281. https://app.dimensions.ai/details/publication/pub.1187514431
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Forte, E., Azzaro, M., Cannone, N., Longhi, A., Santin, I., & Guglielmin, M. (2025). A warming pulse in the Antarctic continent changed the landscape during the Middle Ages. Communications Earth & Environment, 6(1), 281. https://irinsubria.uninsubria.it/handle/11383/2199696
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Forte, E., Azzaro, M., Cannone, N., Longhi, A., Santin, I., & Guglielmin, M. (2025). A warming pulse in the Antarctic continent changed the landscape during the Middle Ages. Communications Earth & Environment, 6(1), 1-9. https://doaj.org/article/a09a09bb3c864eb2a27f3f03f97536e8
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Consiglio Nazionale delle Ricerche (CNR). (2025, April 14). Antartide, scoperto un eccezionale evento di fusione glaciale medievale. https://www.cnr.it/en/news/13452
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Hass, H. C., Schröder, S., & Kuhn, G. (2017). Climate signals in Late Holocene sediments from Maxwell Bay and English Strait (South Shetland Islands, Antarctica). EGU General Assembly 2017, Vienna, Austria.