> We had peak awareness in the 80s and 90s, I remember in school time was dedicated to ecology and the environment.
You can go back to the 70's.
There was a fascinating amount of experimentation in education when I grew up in the 70's. I went to two rather interesting "experimental" schools — one public, one private. But regardless, there was a Zeitgeist in the 70's both of danger (over-population, pollution) but also of optimism — that we could change course as a society if we wanted.
As an anecdote, I remember a fascinating visitor when I was in elementary school. A man showed up in our class with a fascinating machine that was described as a "computer"! (This was perhaps 1973 or so — it may well have been an analog computer.) The thing was upright and perhaps the size of a Pachinko machine. He explained that you could set some dials to represent perhaps human growth, energy use ... something like that. I mean, I was quite young so I think a lot of it flew over my head — perhaps his audience was generally an older age. In any event it was supposed to calculate ... something ... maybe how many years before we ran our of food or fissile fuel or space on the planet....
Afterword: Sadly, speaking of Zeitgeist, it seems something happened around the close of President Carter's term and when Reagan's presidency began. The Metric System they had taught us in elementary school was out the window. Ha ha, even national markers in the U.S. that had added Metric to the Imperial(?) units would dropped the metric units....