This book deploys the concept of innovation to explore normative and institutional responses in international law to the challenges to global order posed by rapid environmental change. In this context the contributions to the book address two key innovation-related themes. The first is the theme of innovation in legal reactions to global environmental problems. How can law anticipate, prevent, and adapt to environmental transformations? This is the notion of 'innovation originating in the legal and policy sphere' and is expressly directed to achieve desired policy outcomes.