In a world challenged by increasingly complex crises, a sound understanding of reality and high quality learning become crucial elements for strengthening children and making societies more resilient and fit for the future. This chapter argues that outdoor learning—even given the fact that quite a few aspects of it are under-researched—can play an important role in contributing to the kind of learning the twenty-first century needs. Outdoor learning enables cumulative, fundamental fostering of learning in multiple dimensions, such as academic learning, social interaction, personal development and well-being, mental, physical and social health, creativity, and much more. It is an add-in approach, easy to integrate into normal schooling, at very low cost. It therefore should be very high up on the agenda of any decision maker who is concerned with the future of our education systems. The chapter elaborates why the reminder of the book is a toolbox for just such decision makers in education authorities, teacher-training universities, schools and research institutions, to systemically embed outdoor learning in their respective practices.