Forty five years ago, on this day, February 1 1978 the PBS “MacNeill Lehrer Report” had various smart people talking about the climate problems ahead (Robert Jastrow, Gordon MacDonald, Stephen Schneider, Clairborne Pell). They let Jastrow go first, shilling his Ice Age is Coming book. Then Gordon MacDonald, who had been warning about carbon dioxide build-up since 1968, and had helped write the first public facing report on it in 1970, was able to respond –
“GORDON MacDONALD: Bob Jastrow talked about the natural fluctuations in climate. I think that basically the picture he drew is correct, except he left out one important factor, that is, man. Man has been doing lots of things that are going to change climate in very significant ways. For example, he`s burning oil, gas, coal, putting the carbon dioxide into the atmosphere. He`s also clearing forests, turning lands that were once covered with biologically active material into areas that are no longer biologically active. That means that the carbon that was once fixed in those forests is now released into the atmosphere. These two effects plus a very important effect, that is, natural gas coming from deep within the earth, coming into the atmosphere and being oxidized, all lead to the greenhouse that you described.”
https://americanarchive.org/catalog/cpb-aacip_507-ms3jw87f1f
And yes, that is Stephen Schneider with hair –
The amount of carbon dioxide in the air was roughly 333ppm. As of 2023 it is 419ppm, but check here for daily measures.
The context was
In 1977 the National Academy of Sciences had released a big fat report saying there was probably a problem about carbon dioxide buildup, and other books had been written in the mid 70s (e.g. Wilcox). So television producers, who were always needing to fill up space and to seem to have their finger on the pulse, will have looked upon this as a good topic. Schneider was a no-brainer. MacDonald and Jastrow were among the JASONs who had been up to their necks as well in ozone discussions, and MacDonald was at the time of this television appearance leading work on a JASON Technical Report “The Long Term Impact of Atmospheric Carbon Dioxide on Climate.”
What I think we can learn from this
These sorts of chin-stroking documentaries and discussion panels have been going on a long time. And at one point, certainly up to this point, they had their place. But since then they have become an opportunity for middle-class people who don’t want to get off their fat asses to say “oh, there’s still a debate going on.”
What is amusing about some of the denialists is they don’t admit (or perhaps even know) that some of the people they pointed to as ‘Big Scientists Who Disagree’ in the 1990s were Ice Agers. That doesn’t fit their narrative (though they never forget to cite the paper Stephen Schneider co-authored with Rasool in 1971…)
What happened next
The contestation over whether carbon dioxide buildup mattered led to a process in 1979 known as the Charney report, which said there’s no reason to think otherwise.
What do you think? Does this pass the ‘so what?’ threshold? Have I got facts wrong? Interpretation wrong? Do comment on this post.