Radical change. In people's behaviour. What a joke. (I'm just sticking to your own words.)
I hoped for that 18-22 years ago too, being 18-22 years old back then.
What has happened since?
Increase of car traffic.
Increase of flights.
Increase of sea cruises (also in the size of the ships).
Increase of use of plastics.
Increase of energy use.
Logistics has largely shifted from train to trucks or other fuel motor vehicles.
We have a generation of twens who don't question taking a car for each few 100 meters, a plane for each inter-European travel and living as vegans which means: with food from anywhere in the world and (partially) as processed as food never was before. And the majority of the elders does not question both first points and the third one only rarely.

I don't disagree on the need of visions completely but you are talking about people who have not grown up in a world of limited ressources, majority of rules and interpersonal dependence. Those people don't care about society's future needs and don't want to be educated either.