Are older generation primarily responsible for unsustainable lifestyle, other probs?

[malkin]

...we could all be wearing hair shirts and living in caves without it making the slightest dent in statistics...

This.

It doesn't matter if we throw out our yogurt containers, reuse them, or make our own yogurt in hand thrown crockery. The thing that isn't 'sustainable' is the population of humans which continues to grow.