Ice Core Data Disrupts Climate Narrative: CO2 Stable as Earth Plunged into Ice Age

A new analysis of ancient ice cores has delivered a direct challenge to a foundational assumption of modern climate science. The data reveals that atmospheric carbon dioxide levels remained remarkably stable, at around 250 parts per million, as the planet descended into a major ice age approximately 2.7 million years ago. This finding contradicts the long-held model that a significant drop in CO2 was the primary driver of that global cooling event. The shock stems from the evidence showing massive temperature swings over a three-million-year period occurred with only minimal, non-correlated movement in CO2 and methane levels.

The research, highlighted by the Daily Sceptic, indicates CO2 levels showed a variation of just 20 ppm across the entire epoch, far lower than the previously assumed 400 ppm baseline used to explain the onset of glaciation. This stability in greenhouse gas concentrations during a period of profound climatic upheaval presents a significant anomaly. For climate activists and scientists aligned with the 'settled science' view, the data creates a substantial puzzle, as it decouples the direct, lock-step relationship between CO2 and global temperature that underpins many current policy arguments and Net Zero mandates.

The immediate implication is intense scrutiny of established climate models and historical narratives. While not disproving the greenhouse effect, the evidence forces a re-examination of other, potentially dominant climate forcings—such as orbital cycles, solar activity, or oceanic currents—that may have overridden CO2's influence during past epochs. This revelation injects fresh tension into the scientific and political debate, putting pressure on institutions to reconcile this paleoclimate data with projections of future warming driven primarily by anthropogenic emissions.