Core Viewpoint - The Dali Bai Autonomous Prefecture in Yunnan Province has been actively engaged in the protection and sustainable development of Erhai Lake, leading to improvements in water quality, environment, and ecology over the years [1][3]. Group 1: Erhai Index and Ecological Protection - The Dali government and the provincial ecological environment department launched the "Erhai Index" in August, which emphasizes a scientific and systematic approach to lake protection [2]. - The "Erhai Index" evaluates ecological protection through four dimensions: cleanliness, clarity, ecology, and sharing, with eight specific indicators [4]. - The index serves as a comprehensive assessment tool for the ecological system of Erhai Lake, helping to guide decision-making for ecological protection [4][6]. Group 2: Monitoring and Technological Integration - Dali has established a "Digital Erhai" platform that integrates a multi-dimensional monitoring network to track water quality and quantity in real-time [6]. - The platform has 428 automatic monitoring stations and video surveillance points, allowing for quick responses to pollution incidents [5][6]. - Since 2016, approximately 47.2 billion yuan has been invested in various ecological protection initiatives, including the construction of sewage treatment facilities and ecological corridors [7]. Group 3: Economic and Ecological Benefits - The ecological protection efforts have led to a significant increase in tourism, with Dali receiving 98.21 million visitors and generating 120.8 billion yuan in tourism revenue in the first three quarters of the year, a 19% increase year-on-year [8]. - The establishment of an ecological compensation mechanism has facilitated the direct supply of 150 million cubic meters of clean water to Erhai Lake, maintaining a 100% water quality rate at key monitoring points [9]. - Local communities have benefited economically from the tourism boom, with the number of homestays in Gusheng Village increasing from a few to over 100 in five years [9].