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 August 18, 1975 – it’s gonna get hotter, not cooler, say scientists

Forty eight years ago, on this day, August 18, 1975, a bunch of people who had been thinking about man’s impact on the climate for quite a while get together in Norwich, England, for a meeting about what’s coming. They decide that there’s no ice age on its way but there IS a decent chance of a large amount of warming…

1975  18-23 August 1975 Norwich meeting which ended speculation about possible cooling.

http://blogs.nature.com/climatefeedback/2008/10/the_great_global_cooling_myth.html

Paterson 1996 is good on this…

The amount of carbon dioxide in the air was roughly 331ppm. As of 2023 it is 423ppm, but check here for daily measures. 

The context was that everyone was interested in the weather – was it getting colder? was it getting warmer? There had been public pronouncement in both directions including, infamously, the 1971 Rasool and Schneider paper. The popular version of this was The Weather Machine by Nigel Calder which became a BBC documentary. And there were questions asked in the House of Commons. 

But the people who actually studied the climate issue were looking closely at carbon dioxide and by now beginning to think this is the issue – we’re going to get warming not a cooling. Wally Broeker’s paper in Science had just been published a month earlier and the National Academy of Science had started its 2-year study on understanding climate.

What I think we can learn from this is that although doubt continued in public because bad ideas and stories have a long half-life this workshop was the moment at which any lingering doubts about the cooling were put to one side, at least in the minds of people who knew what they were talking about.

What happened next was that by 1976 the World Meteorological Organisation was making statements about the likelihood of warming. It was also a very very hot summer in Europe and especially the United Kingdom the 1976 drought which was until 1995 rather the hottest for years. And 2022 was much hotter globally.

But we get used to anything – until we can’t…

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.