That man-made carbon dioxide is the main driver of climate trends is irrational

 

Variations in temperature, CO 2 , and dust fro...

Vostok Ice core: Image via Wikipedia

 

One of a series of debate articles  in Ny Teknik by Professors Björnbom and Ribbing brings a refreshing whiff of sanity into the “closed and settled” science of global climate change. They conclude:

“To now stubbornly stick to the hypothesis that man-made carbon dioxide is the main driver of climate trends, is irrational in the headwinds from a growing number of critical articles based on measurements.”

Pehr Björnbom, Professor Emeritus, Chemical Engineering, KTH

Carl-Gustaf Ribbing, Professor Emeritus, Solid State Physics, Uppsala University

A free translation of their article is reproduced below:

Azar, Eriksson, Tjernström and Westerstrand, AETW, write: “strange that on the basis of only one study … rejecting decades of research “. This is a misleading summary of many years of development. For our article, and the references to the PDF version, showing a lower climate sensitivity than that shown by the UN’s Climate Change organisation, the IPCC, is not a new phenomenon. In less than ten years, the IPCC’s high values have been  disputed, partly because global warming has been lower than was predicted.

Instead of reducing the excessive carbon dioxide sensitivity the aerosol contribution has been increased to reduce climate sensitivity. In principle it is better to use measurements from high altitude, rather than parameter dependent adaptations to climate models to the Earth’s surface temperature.

AETW write about the glacial cycles that it is “.. very difficult to explain how Earth’s temperature can vary by as much as five degrees … between an ice age and a non-glacial climate when sensitivity is … one degree or less. ” It is “very difficult” only with today’s climate, which shows that the narrow focus on “explaining” the climate variations of carbon dioxide leads to absurdities.
We wonder why Per Ribbing blames us for over-simplification? What we are against is precisely the unilateral selection of the carbon dioxide created by human activity to be the dominant factor in climate regulation. We assert the contrary, that a half-dozen natural factors govern the very complex climate system. It will probably never be scientifically possible to completely describe this chaotic system.
Spencer and Braswell are making great progress with their phase diagram, so that variations in the natural driving forces can be separated from the feedbacks. This gives a higher correlation and a more accurate value of climate sensitivity: 0.6 degrees without the aid of climate models.
This uncertainty gives the obvious; that values can increase or decrease for longer periods than any measuring period. To now stubbornly stick to the hypothesis that man-made carbon dioxide is the main driver of climate trends, is unreasonable in the headwinds from a growing number of critical articles based on measurements.

Pehr Björnbom, Professor Emeritus, Chemical Engineering, KTH

Carl-Gustaf Ribbing, Professor Emeritus, Solid State Physics, Uppsala University

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