This introductory textbook with a global scope aims to train students of geography, sustainability, and urban and environmental studies to re-imagine and transform cities to meet climate, biodiversity, and sustainability challenges. A dedicated team of authors critically examine the relationships between nature and urban areas, sharing an inspiring account of how nature helps us re-think our cities and their futures. Prior to this textbook, literature for courses covering urban nature was written by and for practitioners, whereas this textbook is written by experienced course instructors specifically to be accessible to diverse students. The textbook is illustrated with numerous photos and figures which bring key topics, challenges, and opportunities to life. It contains focus boxes and case studies from every continent, offering students an international scope and multiple entry points into the field. Chapters conclude with thought-provoking follow-up questions and recommended reading. The authors provide an array of supplementary online resources.