The leftists only consider the term sustainability with regard to the Earth's resources. To succeed in getting millenials to disavow socialism and move toward Capitalism: The Unknown Ideal, we need to use the term sustainability to point out their inconsistency. The cost of every program that they propose (climate change carbon taxes, Obamacare, "free" college, etc.) is UNsustainable. The national debt is UNsustainable. I think I have stumbled onto the way to help millenials "unlearn what they have (mis)learned".