Fifty five years ago, on this day, March 4th, 1970, a snappily titled academic paper was submitted
Variations of the carbon dioxide content of the atmosphere in the northern hemisphere By BERT BOLIN and WALTER BISCHOF, Institute of Meteorology, University of Stockholm
(Manuscript received March 4, 1970; revised version May 28, 1970)
ABSTRACT
Six years of measurements (1963-1968) of carbon dioxide in the troposphere and the lower stratosphere are presented. The data reveal an average annual increase of the C0,-content of 0.7 +O.l ppm/year, while during this time the annual industrial output has increased from about 1.9 ppm to 2.3 ppm/year. Thus the increase in the atmosphere is about & of the total output. Considerations of the possible increase of vegetative assimilation due to the higher COX-content of the atmosphere reveals that this is at most of the output, probably considerably less. The net transfer to the oceans thus is at least equal to + of the industrial output. The transfer rate across the sea surface seems effective enough not to represent an appreciable resistance and the decisive factor for determining this transfer therefore is the ocean circulation or turn over rate. The figures quoted indicate that 20-25 %, of the world oceans must have been available during the time of rapid increase of the industrial output of CO, (the last 30-50 years) to explain the rather large amount that has been withdrawn from the atmosphere. Still a continued increase of the fossil fuel combustion as forecast by OECD implies that the C0,-content of the atmosphere at the end of the century will be between 370 pprn and 395 ppm as compared with 320 ppm, the average value for 1968.
The amplitude of the seasonal variation is found to be about 6.5 ppm at 2 km and 3.5,ppm in the uppermost part of the troposphere. The phase shift of the seasonal variation between these two levels is 25-30 days. On the basis of these data a vertical eddy diffusivity K = 2. lo6 cm2 sec-l is derived. The amplitude of the seasonal variation in the lower stratosphere, 11-12 km, is less than…

The amount of carbon dioxide in the air was roughly 325ppm. As of 2025 it is 427ppm, but check here for daily measures.
The context was that Bolin had been switched on fifteen years previous to the issue of carbon dioxide build up. He’d studied, after all, under Rosby, who died prematurely. Bolin had really caught hold of Keeling’s data and understood even then, I think the implications, (see 1959 Science Notes).
Bolin kept beavering away on the science, but also on the politics. And this paper is fairly typical. The findings are not necessarily startling, but in retrospect, they are part of the ominous “pending debacle” of it all.
(Fwiw, Bolin was also helping Keeling in Europe at this time, I’d need to go and reread Keeling’s biography to get the details right)..
The other context is that by the time this was submitted, even the king of the Netherlands was talking about CO2 build up at the beginning of 1970, the European Conservation Year.
What I think we can learn from this is that we knew plenty, we just didn’t understand and we didn’t want to accept the implications.
What happened next Bolin kept at it. The 1970s saw him begin to team up with Mustafa Tolba, head of the United Nations Environment Program, which was possibly the one thing that emerged from the Stockholm conference in 1972.
Bolin would talk to journalists about CO2 build up (see 1978 BBC radio documentary).
Bolin was the obvious pick, unanimous, I think, to be chair of the IPCC, which he obviously held for quite some time. And if anyone can be said to have died a good a well-timed death, it’s Bolin. He died just after the 2007 Bali COP, which obviously he did not attend because he was too ill. The Bali COP saw the “roadmap to Copenhagen” laid out. So he died thinking that maybe just maybe, we wouldn’t be entirely too late to act on the warnings that he had been giving since 1959
Thank goodness he was not still alive to witness Copenhagen.
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 4, 1998 – The Australian Greenhouse Office gets a boss…
March 4, 2003 – “Luntz memo” exposes Bush climate strategy
March 4, 2023 –Letter in FT: Global carbon price call is a classic delaying tactic
March 4, 2003 – Republicans urged to question the scientific consensus…
March 4, 2004 – The Australian National Audit Office skewers the Australian Greenhouse Office