This book aspires to establish a dialogue among the studies of sustainable development, global environmental politics, comparative regionalism, and area studies of Eurasia. The chapters in this book reflect deep knowledge of the authors of the main trends in environmental politics at global, international, and national levels before the invasion in Ukraine in 2022. First, the book looks into the role and impact of international organizations such as the European Union (EU), European Bank for Reconstruction and Development (EBRD), Arctic Council (AC,) and Global Forums on Climate Action on post-Communist states, but also the role of nation-states (e.g., Russia, Kazakhstan, and China). Second, the book explores relatively new international organizations, such as the Eurasian Economic Union (EAEU), the Eurasian Development Bank, and the Shanghai Cooperation Organization (SCO). How do the EAEU, EDB, and the SCO matter, if at all, in promoting an environmental agenda? How do the EU, EBRD, and the AC advance the environmental agenda across the post-Communist region? This book aspires to answer these questions and to shed more light on the challenges to sustainable development in post-Communist Europe, Central Asia, and Eurasia. With a new foreword and afterword, this book will appeal to students, scholars and researchers of political science, international relations, area-studies as well as practitioners and policymakers working in international organizations and dealing with challenges of sustainable development. The other chapters were originally published as a special issue of Problems of Post-Communism.