[Hjfrf]

Excessive consumption as fashion has gone the other way for young kids.

Environmentalism seems to be "cool af",to the point where not owning a car is virtue signalling.

[nebula8804]

I think part of it has to do with the possibility that they are just poorer on average compared to their parents. Circumstances help define the culture so rallying against excessive consumption is more in vogue when you cannot consume in the first place.