" Sustainability, or fairness to the future, therefore involves the concept of stewardship, the idea that the living generation must be stewards of the earth’s resources for the generations that will come later. That’s a tough role to play. There is nothing natural or innate about it. We need to defend the interests of those whom we’ve never met and never will. Yet those are our descendants and our fellow humanity. Alas, it’s a role that we’ve mostly ignored till now, to the increasing peril of all who will follow. The "

― Jeffrey D. Sachs , The Price of Civilization