This book analyzes climate policy integration processes by investigating cause-effect relations in cases of integrating climate policy in energy and land-use sectors of Indonesia and Mexico, taking a novel comparative case study approach. The book identifies root causes for integration outside of the public administration, discussing decisive factors in the political economy of the energy and land-use sectors. Showing how policy windows may open for the successful integration of climate policies nevertheless, the book addresses the need to identify and properly use these windows to establish the administrative and institutional arrangements for effective climate policy implementation. This book offers two-fold insights for overcoming the challenges posed by climate policy integration: Firstly, it contributes to theory-building by amending theories of the policy process and by taking a wider perspective on the role of integration in the context of transformational change processes in emerging economies. Secondly, it sets forth a set of research-based practical policy recommendations on how to foster climate policy integration in the political decision-making processes as well as the public administration structures. Therefore, this book will appeal to scholars and researchers of public policy, public administration, political science, and environmental sciences, as well as policy-makers and practitioners interested in a better understanding of climate policy integration in energy and land-use sectors.