This book has examined how private rule makers are contributing to the management of global environmental problems by rethinking the meaning of private authority. It has shown that private authority is diffused through and among a diverse set of actors, creating multiple loci for rule-making and governance. It has also distinguished two different types of private authority: delegated authority and entrepreneurial authority. This concluding chapter summarizes the book's findings and considers their theoretical implications—namely, appropriate ways to evaluate the effects of private authority in world politics. It suggests potential contributions of private authority to the climate change regime as it moves forward. Finally, it outlines future avenues for inquiry, situating this study within a much broader set of questions about institutional complexity and density and the effects of private authority over time.