Core Viewpoint - The construction of a "cool city" in Haikou, Hainan Province, is a systematic practice aimed at addressing urban heat island effects through ecological foundations, spatial reconstruction, technological empowerment, and institutional innovation, ultimately enhancing the quality of life for residents [1][2][8]. Group 1: Ecological Foundations - Haikou is implementing a "wetland+" governance model to protect and enhance its wetland areas, which cover over 32,000 hectares, representing a wetland rate of 13.32%. This includes various projects that integrate water body management and coastal protection [3][4]. - The city has established a comprehensive ecological cooling network, utilizing natural elements such as wetlands and vegetation to function as natural "cool sources" [2][3]. Group 2: Spatial Reconstruction - Haikou has transformed underutilized urban spaces into 174 "pocket parks," increasing the park green space to 26.39 million square meters, with a per capita green space of 12.1 square meters [4][5]. - The city prioritizes the protection of key water bodies and the construction of ventilation corridors in its land use planning, ensuring natural airflow into urban areas [5][6]. Group 3: Technological Empowerment - The design and material selection in buildings are crucial for the "cool city" initiative, with passive and active measures being employed to reduce heat loads [6][7]. - Notable examples include the use of high-reflective materials in the construction of the Hainan Provincial Party School, which has over 70% of its exterior surfaces reflecting at least 0.4 of solar radiation [6][7]. Group 4: Systematic Governance Insights - The "cool city" initiative demonstrates the importance of a systematic governance approach, integrating ecological, spatial, architectural, and institutional elements to create a cohesive cooling strategy [7][8]. - The initiative emphasizes the need for climate adaptability in urban governance, ensuring that climate considerations are embedded in planning and design processes [7][8]. Group 5: Economic and Ecological Benefits - The "cool city" construction aligns with green and low-carbon development goals, showcasing how ecological benefits can be integrated with public welfare, such as the creation of green spaces and improved urban comfort [8]. - The transformation of urban structures and energy systems through the "cool" initiative is seen as a pathway to achieving carbon neutrality goals [8].