Why Venus Data Undermines The Consensus On Greenhouse Gas Warming

Venus’s extreme temperatures pose questions that, the author argues, standard greenhouse theory cannot adequately answer.

Douglas J. Cotton | October 10, 2026

Climatologists continue to insist that the extreme surface temperature of Venus is caused by its carbon-dioxide-rich atmosphere. As a physicist who has undertaken extensive, self-funded postgraduate research into atmospheric thermodynamics—including a world-first discovery published in my 2013 paper Planetary Core and Surface Temperatures—I can state unequivocally that this claim is physically untenable. The same applies to Earth: carbon dioxide, methane, and water vapor cannot be the drivers of global mean surface temperature.

Because Venus has a far deeper atmosphere than Earth, little more than ten percent of Earth’s solar flux reaches its surface. Such a weak flux is nowhere near sufficient to explain the observed surface temperature. Yet when the IPCC first published its “Energy Budget Diagrams,” it overlooked a fundamental error: the diagrams showed only solar radiation warming the surface. That is not what happens, and the laws of physics make this clear.

Early IPCC diagrams claimed that direct solar radiation warmed the surface and that “greenhouse gases trap heat,” supposedly forcing the solar flux to produce far more warming than physics allows. But applying the Stefan–Boltzmann Law to the IPCC’s own numbers reveals a glaring contradiction: the amount of solar radiation allegedly absorbed by Earth’s surface (51% of the incident flux at the top of the atmosphere) could produce only a global mean surface temperature of about 233 K—roughly –40°C. That climatologists failed to recognize this for decades speaks volumes about the level of........

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