This book addresses the core tenets, logic, methodology and practice of Xi Jinping's thoughts on ecological civilization. It traces the theoretical origins of his ideas and comprehensively discusses their theoretical characteristics and historical status, while also demonstrating that they represent a self-contained theoretical system and discourse system. In addition, the book offers guidelines on putting his thoughts into practice in connection with the new era of socialist ecological civilization in China, implementing the 2030 sustainable development agenda action plan and contributing to global ecological security.