Forty six years ago, on this day, July 23rd,
1979 Ad Hoc Study Group on C02 and Climate at Woods Hole from 23 to 27 “Charney Report”
http://web.atmos.ucla.edu/~brianpm/download/charney_report.pdf
The amount of carbon dioxide in the air was 337ppm. As of 2025, when this post was published, it is 430ppm. This matters because the more carbon dioxide in the air, the more heat gets trapped. The more heat, the more extreme weather events. You can make it more complicated than that if you want, but really, it’s not. Fwiw, I have a tattoo of the Keeling Curve on my left forearm.
The broader context was that through the 1970s scientists working on climatology, pollution, energy, food were starting to study carbon dioxide build-ups effects and saying in effect “er, we may have a serious problem on our hands”. This was true especially in (parts of) Europe and the US.
The specific context was that the Carter Administration was rather taken with shale oil as a way of securing “energy independence”. This raised the question of CO2 build-up to serious concern, and Jule Charney was asked to come up with a “definitive” answer to whether it was something to take seriously.
What I think we can learn from this – sometimes an issue will be “entrained” because of another one (in fact, that is surely the norm, but we struggle to understand it). In this case, an “environmental” issue gets a boost because of energy policy debates….
What happened next Charney et al basically said “there’s no reason to believe that a doubling in atmospheric concentrations of carbon dioxide – which are likely by 2050 or so – will do anything other than result in an increase of global average temperatures of somewhere between 1.5 and 3.5 degrees.”
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:
July 23, 1979 – Charney Report people meet – will conclude “yep, global warming is ‘A Thing’.”