Sixty nine years ago today, March 25, 1957, Gilbert Plass was at a Scripps conference in La Jolla, California.
Proceedings of a Conference held at Scripps Institution of Oceanography, La Jolla, California, 25-26 March 1957:



The amount of carbon dioxide in the air was roughly 314ppm. As of 2026 it is 428ppm, but check here for daily measures.
The broader context was that scientists had been doing science for, well, the word science comes from the 1820s before that, they were “natural philosophers.” Concern/awareness that carbon dioxide build up in the atmosphere might eventually warm up the Earth, I suppose can be dated to Svante Arrhenius in 1895-96. His work was contested and then largely, but not totally ignored. Guy Callender had given a presentation in 1938 to the British Royal Meteorological Society.
The specific context was that in 1953 Canadian physicist Gilbert Plass, building on Arrhenius and Callendar, had started the ball rolling on “carbon dioxide build-up as a problem.” In the next couple of years other people had said similar. And then by this time, the International Geophysical Year was about to kick off.
And we know now, thanks to the work of Rebecca John that Charles David Keeling had been doing Carbon Dioxide measurement for various oil companies.
Revelle and Seuss had been working on papers.
What I think we can learn from this is that by 1957 a whole bunch of American (mostly – though here I am doing a real injustice to the Swedes) scientists, including Joseph Kaplan etc, were looking at carbon dioxide and going, “you know, this might well be a serious problem.”
What happened next Plass published another article in Scientific American in 1959 which was advertised in the Observer. Plass was there in January 1961 in New York, and again, 63 in New York at the Conservation Foundation’s meeting, and that was his last that I can find around any engagement with the CO2 issue. He had said everything he planned to say. He’d worked on it now for over 10 years, and he understandably moved on to other things. It was a basic physics problem that he had solved.
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.
References
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Also on this day:
March 25, 1982 – congressional hearings and CBS Evening News report
March 25, 1988- World Meteorological Organisation sends IPCC invites.
March 25, 1995 – “Women and the Environment” conference in Melbourne
March 25, 2013 – Australian Department of Climate Change axed


