Fifty six years ago, on this day, November 25th, 1968, some carbon dioxide samples got collected…
INADVERTENT MODIFICATION OF WEATHER AND CLIMATE
BY ATMOSPHERIC POLLUTANTS E.W. Barrett , R.F. Pueschel , H.K. Weickmann , and P.M. Kuhn, in this
The amount of carbon dioxide in the air was roughly 323ppm. As of 2024 it is 423ppm, but check here for daily measures.
The context was that scientists were beginning to start to measure CO2 locally along with other pollutants because by 1968 some people were starting to get a little bit worried about all this. This is a really minor event. I’m not pretending that it deserves much of a place, I only include it because we need to know that people were looking at this stuff. It was part of the mix.
What we learn: The concerns go back to the sixties…
What happened next Earl Barrett was in Melbourne in 1970 to present some of this work, and then had a letter in science in I want to say September of 1971.
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:
November 25, 1993 – House of Commons briefing on carbon taxes