The unbearable invisibility of working solutions

I had an o sancta simplicistas moment yesterday via bsky, where somebody was posting, somebody's post from Some Other Social Media, saying that as somebody whose job is entering up medical codes, for A Long Time Now they have never had to input the codes for polio, pertussis, measles, rubella, mumps, etc and really doesn't know why they are bothering to vaccinate for these defunct ailments anymore....

(I also saw something about one of the last people to still be in an iron lung as a result of polio pre-vaccines, and this is still, at least for us Olds, living memory.)

Admittedly, I also saw somewhere somebody going yay Ozone Layer Hole is fixed Nature is Healing but I find that Scientists are Sceptical, or at least cautious in their optimism over that and that perhaps it is All More Complicated than simply doing away with CFCs (and the wildfires and so forth have Not Helped).

Massive improvement in fighting the Invisible London Pertiklers of the present day: London Ulez averts more air pollution than that caused by capital’s airports, report shows:

The London mayor, Sadiq Khan, said: “The decision to expand the Ulez was not something I took lightly but, when confronted by the evidence, it was clear that clean air zones like these are the most effective way to cut toxic air and meaningfully protect people’s health.
“In a few short years the Ulez has prevented tens of thousands of tonnes of toxic nitrogen oxide emissions from being released and the London-wide expansion is enabling 5 million more Londoners to breathe cleaner air.”
Khan said that non-transport sources still contributed half of the deadly emissions produced in London, and called on the government to provide the necessary funding and powers to allow the capital to tackle other sources of air pollution.

Public health schemes such as London’s Ulez can be traced back to the study that found an association between air pollution and mortality.

I am reminded, somehow, of the Disasters That Did Not Happen Because Preparedness... (Y2K, e.g.).