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INTRODUCTION based knowledge for promoting sustainability has been impressive indeed. The commitment of sustainability science to problem-driven agenda setting does not mean that it has been confined to ‘‘applied’’research. Indeed, pursuit of practical solutions to the pressing challenges of sustainability has driven the field to tackle an array of fundamental questions. The Friibergh Workshop on Sustainability Science (5) identified a half-dozen such core conceptual questions that have been further developed through the virtual Forum on Science and Technology for Sustainability (22) and are beginning to appear in the context of emerging agendas in other more established fields, such as global environmental change (23). Examples of the new sorts of research now beginning to emerge on several of those core questions are reported elsewhere in this Special Feature: Kates and Parris (24) on ‘‘How are …