Shock New Evidence Showing No Link Between CO2 and Temperature Over Last Three Million Years Stumps Net Zero Activists
The excuses start rolling in
Chris Morrison
Mar 24, 2026
The climate science world (‘settled’ division) is in shock following the discovery in ancient ice cores that levels of carbon dioxide remained stable as the world plunged into an ice age around 2.7 million years ago. Levels of CO2 at around 250 parts per million (ppm) were said to be lower than often assumed with just a 20 ppm movement recorded for the following near three million-year period. In addition, no changes in methane levels were seen in the entire period. Massive decreases in temperature with occasional interglacial rises appear to have occurred without troubling ‘greenhouse’ gas levels, and this revelation has caused near panic in activist circles.
The assumed level three million years ago of CO2 was around 400 ppm, a convenient mark that has been used to explain the subsequent ice age and a drop to 250 ppm. Due to the recently published paper, this explanation has become more problematic and natural climate variation is correctly noted to have occurred with the temperature changes. Alas, similar explanations are mostly ignored in discussing today’s climate changes in the interests of promoting the Net Zero fantasy. Some cling desperately to a dominant CO2 role, including one of the authors of the findings published in Nature. The co-author states that the results suggest even greater climate sensitivity to the warming effect of CO2. In short, there is a great deal of applying the laws of physics and chemistry to one era, but failing to extend the same courtesy to another.
The title of the paper, produced by 17 America-based scientists, was enough to set alarm bells ringing in the ‘settled’ science, Net Zero-obsessed community: ‘Broadly stable atmospheric CO2 and CH4 levels over the past three million years.’ A related paper examining ocean heat content derived from the ice core record was also published. Carrie Lear, Professor of Past Climates and Earth System Changes at Cardiff University, claimed that the papers “don’t rewrite the role of CO2, they underline how sensitive the climate system is… that is why today’s rapid CO2 rise is so alarming”.
https://www.climateskeptic.org/p/shock-new-evidence-showing-no-link
