

Just wanted to add that maybe the last thing that we did for the environment and that really worked was for acid rain in 1991. At least where I live.
A few years before that there was the Montreal Protocol that banned CFCs and helped to heal the hole in the ozone layer. I think.
But yeah, I don’t remember anything of the sort recently,
When I started a new job in IT around 2009, I learned that AS400 / iSeries / IBM i was a thing, and it’s still doing pretty well with big retail and the insurance business.
In the same vein, the system used by the aviation industry to book flights is also quite ancient but still very much used to this day.