I think people are emphasizing the peculiar relationship between investment/growth and staving off disaster. Oil is "unsustainable" it is not a Ponzi scheme (in

I think people are emphasizing the peculiar relationship between investment/growth and staving off disaster. Oil is "unsustainable" it is not a Ponzi scheme (in the popular sense) because if people doubled the amount of oil they bought this year this would, in general, bring the endgame closer and not further.