I was lucky. Growing up in Norway, I had one main teacher in elementary school, one in middle school, and one in high school. The ones I had in middle and high school both aimed at highlighting the systemic problems in society. At the time, several teachers in social sciences, history, and language, were university-educated “radical” intellectuals. (I don’t know how it is now.)
My teacher in middle school introduced me to The Turning Point by Fritjof Capra which changed my life. First year of high school, I think my teacher there introduced me to Bak Tid of Rom by Erik Damman which was also very important to me. (I may have discovered it in a bookstore, if I am honest, but I suspect my teacher mentioned it to us.)
The first by going through scientific research on topics that cannot be explained by a materialistic worldview.
The second by introducing me to systems views, Eastern philosophies, domination versus partnership cultures, the importance of worldviews, and the need for a thorough transformation in our worldview and all aspects of our culture if we are to create an ecologically sound civilization.
I put radical in quotation marks since they were not really radical. They supported democracy. They wanted what was good for individuals, society, and future generations. They promoted human rights and spoke up about social injustice. That’s what a kind and healthy human being naturally does.