*I’m not really sure how you’re defining “extreme risk”, but the examples you gave all have meaningfully life-changing implications for >10s of millions of people. These examples are lesser in severity and/or scope, but seem like they still caused strong policy responses due to overestimated risk (though this warrants being careful about ex ante vs. ex post risk) and/or unusually high concern about the topic.
Some more examples of risks which were probably not extreme*, but which elicited strong policy responses:
Y2K (though this might count as an extreme risk in the context of corporate governance)
Nuclear power plant accidents (in particular Three Mile Island and Chernobyl)
GMOs (both risks to human health and to the environment; see e.g. legislation in the EU, India, and Hawai’i)
various food additives (e.g. Red No. 2)
many, many novel drugs/pharmaceuticals (thalidomide, opioids, DES, Fen-phen, Seldane, Rezulin, Vioxx, Bextra, Baycol...)
*I’m not really sure how you’re defining “extreme risk”, but the examples you gave all have meaningfully life-changing implications for >10s of millions of people. These examples are lesser in severity and/or scope, but seem like they still caused strong policy responses due to overestimated risk (though this warrants being careful about ex ante vs. ex post risk) and/or unusually high concern about the topic.