The idea that human societies, at their best, seek to evolve toward a more perfect embodiment of humankind’s shared aspirations for peace, freedom, justice, prosperity, personal and collective wellbeing. Today, and for the foreseeable future, that list also includes sustainability: living within the natural carrying capacity of our planet, in order to preserve and protect the wellbeing of Earth’s biosphere upon which all living things depend for survival. Over many centuries, human societies have devolved away from sustainability. It is high time to evolve back.