That was only in terms of "sex, drugs and rock 'n' roll". On a world wide stage, in terms of political aspirations student protest didn't achieve much, except perhaps destroy half of Paris (68). The 'World will End' scenarios were played out against the background of the Cold War, from the Cuba Missile Crisis through to the 'Star Wars' deployment by the US. Young peoples involvement in World wide events or expectations were severely limited by the 'grown ups' despite the numbers being on the side of the young.
In todays world young people all over the earth, although there maybe less of them in Europe, are much more politically aware, not just about climate change, but the demand for democracy, say e.g. in the Middle East, about Fair Trade issues, about the effects of (sometimes limited) warfare on refugees, ethnic cleansing etc.
Todays young people maybe less in numbers, but are more aware of the world around them. The fact that a 16/17 year old girl can draw the attention that Greta does on the world stage, is a phenomenon in its self. The need to 'do something', besides stamping your feet and howling at the moon, using the vote where in past generations 18 years olds couldn't be bothered, are all now very obvious to the young. Young people will have to lead the way, be prepared to sacrifice the lifestyles most still follow and above all organise on a World wide basis... but are they collectively willing, capable and energised enough?
Where are the next 1000 Greta's coming from, because it will be a numbers game in the end, it always is in the world of the homo sapiens?