Group 1 - The core theme of the investigation is "ecological environment and green low-carbon development," emphasizing the importance of implementing Xi Jinping's ecological civilization thought and promoting a harmonious coexistence between humans and nature in Changsha [1][3]. - The investigation includes a visit to Hunan Renhe Environmental Technology Co., where the focus is on the innovative technology and effectiveness of kitchen waste collection and processing [3]. - The importance of waste classification is highlighted as a key issue for public welfare, with a call for continuous optimization of the classification system and support for technological innovation in enterprises [3]. Group 2 - At the Shibei Dagan watershed comprehensive governance project site, the emphasis is on addressing urgent environmental issues faced by the public and effectively advancing the rectification of problems identified by central ecological and environmental inspections [6]. - The investigation also includes a visit to the air quality monitoring station in Mapoling, where the focus is on monitoring air pollutant concentrations and the operation of data transmission and early warning mechanisms [11]. - The project at Hongda Explosive Engineering Group's office building is recognized for its innovative dust control measures, with a call for dynamic analysis of air pollution sources and targeted strategies to improve ecological quality [11].