Core Viewpoint - The article emphasizes the importance of international scientific cooperation and China's role as a strong advocate and active practitioner in this field, highlighting the contributions of Chinese scientists to global development and progress [1]. Group 1: Contributions to Water Resource Management - In the 1970s, China faced challenges in accurately calculating small watershed rainfall runoff, particularly in data-scarce regions, which posed uncertainties for flood prevention and major engineering projects [2]. - Liu Changming led a team to conduct extensive field observations and artificial rainfall experiments over six years, resulting in the creation of a calculation formula for small watershed rainfall peak and bridge flow, significantly improving prediction accuracy [2]. - This method has been successfully applied in major national projects like the Qinghai-Tibet Railway and the Lanzhou-Xinjiang Railway, saving substantial construction costs and providing a mature Chinese solution for hydrological calculations in data-scarce areas [2]. Group 2: Theoretical Innovations and Global Impact - Liu Changming shifted focus from merely conserving water resources to innovative management strategies, proposing the "Five Water Transformation" theory, which explains the cyclical mechanisms among various water forms [5]. - His concepts of "seizing water resources from evaporation" and "rainwater resource utilization" have played a crucial role in transitioning global water management from a demand-driven model to a system regulation approach, contributing Chinese wisdom to sustainable water resource utilization [5]. - Liu's influence extends to international affairs, having held significant positions in organizations like the International Geographical Union and actively participating in the formulation of international water regulations and standards [5]. Group 3: Ongoing Contributions and Vision - Even in his advanced years, Liu Changming remains active in research and international cooperation, advocating for water as a source of peace and development that connects humanity with nature and nations [6].