The document summarizes sustainable thinking and practices for libraries. It discusses how sustainability involves more than just daily green actions like recycling and involves embedding sustainable thinking into an organization's culture, mission, and processes. It provides examples of how libraries can commit to sustainability through policies, goals, and changing daily habits and operations in areas like energy use, transportation, food, and materials. The document advocates for sustainability to be a clearly articulated organizational purpose that is achieved through engaged people and thoughtful process changes.