Forty seven years ago, on this day, February 20, 1979 the following was published –
“An Assessment of the Possible Future Climatic Impact of Carbon Dioxide Increases Based on a Coupled One-Dimensional Atmospheric-Oceanic Model” Hunt and Wells
https://doi.org/10.1029/JC084iC02p00787
A radiative-convective equilibrium model of the atmosphere has been coupled with a mixed layer model of the ocean to investigate the response of this one-dimensional system to increasing carbon dioxide amounts in the atmosphere. For global mean conditions a surface temperature rise of about 2°K was obtained for a doubling of the carbon dioxide amount, in reasonable agreement with the commonly accepted results of Manabe and Wetherald. This temperature rise was essentially invariant with season and indicates that including a shallow (300 m) ocean slab in this problem does not basically alter previous assessments. While the mixed layer depth of the ocean was only very slightly changed by the temperature increase, which extended throughout the depth of the mixed layer, the impact of this increase on the overall behavior of the ocean warrants further study. A calculation was also made of the temporal variation of the sea surface temperature for three possible carbon dioxide growth rates starting from an initial carbon dioxide content of 300 ppm. This indicated that the thermal inertia of the slab ocean provides a time lag of 8 years in the sea surface temperature response compared to a land situation. This is not considered to be of great significance as regards the likely future climatic impact of carbon dioxide increase.
The amount of carbon dioxide in the air was roughly 337ppm. As of 2026 it is 428ppm, but check here for daily measures.
The broader context was the idea that carbon dioxide build-up could warm the planet goes back to Arrhenius in 1895. The idea got nudged forward by Guy Callendar in 1938 onwards, and then pushed to the next level by Gilbert Plass in 1953.
The specific context was that by the late 1970s, it was broadly agreed among the relevant scientific community that there was serious trouble ahead, and this is laid out in painstaking and painful detail in William Barbat’s CO2 Newsletter, which I am releasing through the course of 2026.
What I think we can learn from this is that information on its own, the truth on its own, will not set you free.
What happened next: More studies, more emissions, more concentrations, spasms of protest, but no action worthy of the name to actually bend the emissions curve down, and certainly reducing atmospheric concentrations of CO2 via various so called draw down projects is a complete fucking fantasy.
And I didn’t have kids because the second half of the 21st Century is going to make the first half of the 20th look like a golden age of peace, love and understanding. But I’m standing here narrating this, looking at sparrows and finches and things and I guess it’s my job just to enjoy it for as long as I can. I suppose.
What do you think? Does this pass the ‘so what?’ threshold? Have I got facts wrong? Interpretation wrong? Please do comment on this post, unless you are a denialist, obvs.
Also on this day:
February 20, 1966 – US Senators told about carbon build-up by physicist
February 20, 1970 – South Australian premier sets up an Environment Committee