This book defines regional climate leadership in East Asia and the Pacific as a novel addition to the climate leadership theory. It develops criteria for measuring such leadership on a country basis and uses these for assessing the efforts of developed, lesser-developed, and developing countries within these regions. The book suggests that regional climate leadership consists of leading domestic actions, leading actions within the region, leading actions that are regionally coordinated, and leading actions on a differentiated basis between countries with greater and lesser capacity, and with neighbourly intent. The book is policy and climate solutions-focused, and identifies opportunities for lesson learning and policy transfer for more effective mitigation and adaptation. These solutions take into account the widely varying and complex geographical, political, and institutional circumstances of the region. It is intended for a broad readership of climate policy actors, including policy professionals, academics, non-government researchers, and all who are looking for climate leadership solutions to the problems of accelerating climate impact in East Asia and the Pacific.