This book details previous discussions about the concept of global climate governance and its limits. The author puts forward a theoretical proposal for re-territorialization and coordination of policies for climate change into new forms of articulating interests in what she terms transnational green economic regions (TGERs) and tests this on two case studies - the Regional Greenhouse Gas Initiative (RGGI) and the Western Climate Initiative (WCI). This study presents the challenges and opportunities of a transregional approach in North America.