Thirty years ago, on this day, July 11th, 1995,
The July 1995 Chicago heat wave led to 739 heat-related deaths in Chicago over a period of five days.[1] Most of the victims of the heat wave were elderly poor residents of the city, who did not have air conditioning, or had air conditioning but could not afford to turn it on, and did not open windows or sleep outside for fear of crime.[2] The heat wave also heavily impacted the wider Midwestern region, with additional deaths in both St. Louis, Missouri[3] and Milwaukee, Wisconsin.[4]
The amount of carbon dioxide in the air was 361ppm. As of 2025, when this post was published, it is 430ppm. This matters because the more carbon dioxide in the air, the more heat gets trapped. The more heat, the more extreme weather events. You can make it more complicated than that if you want, but really, it’s not. Fwiw, I have a tattoo of the Keeling Curve on my left forearm.
The broader context was that poor people are always on the pointy end of “natural” disasters, be they floods, heatwaves, pandemics etc.
The specific context was that 1995 was the year the second assessment report of the IPCC came out. It included the fateful words that there was already a “discernible” impact of human activity, which drove the denialists to new heights (depths) of venality and stupidity.
What I think we can learn from this. We’ve had a lot of warnings about what is coming. But on each step of the way there will be people who want/need to dismiss the warnings – “there have always been heat waves” etc., And then it gets into a sterile attribution debate, and the denialists are happy…
What happened next The emissions kept climbing, and these sorts of one-in-a-hundred year events started happening more frequently.
There is a book about the social dynamics of the mortality risk, btw. I haven’t read it, but someone whose intellect I respect raved about it.
Eric Klinenberg, 2002 Heat Wave: A Social Autopsy of Disaster in Chicago,
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: