Core Viewpoint - The article highlights the successful reopening of the Seine River for swimming in Paris, marking a significant achievement in urban waterway restoration and public health initiatives amid climate change challenges [3][4]. Group 1: Investment in Infrastructure - Paris and its surrounding areas have invested €1.4 billion in infrastructure to improve the water quality of the Seine River, upgrade sewage treatment systems, and construct a giant reservoir with a capacity of 50,000 cubic meters to store excess rainwater during storms [3]. - The Seine River now hosts over 30 species of fish, a significant increase from just 3 species in the 1970s, showcasing the success of long-term river cleaning efforts [3]. Group 2: Climate Change Response - The initiative to open the Seine for swimming is part of a broader strategy to create "cool networks" in response to rising global temperatures, which includes building swimming areas and green spaces to help people cope with heat [3]. - Other European cities, such as Amsterdam and London, are also pursuing similar projects to restore urban waterways for recreational use, indicating a growing trend in urban climate adaptation strategies [3][4]. Group 3: Community Engagement and Legacy - The Paris administration aims to leave a lasting legacy by stopping river pollution, improving water quality, and promoting ecosystem restoration, which is seen as a crucial element in addressing climate crises [4]. - The positive reception from visitors and the interest from other regions in opening swimming areas reflect a successful community engagement strategy, with activists in other French regions inspired to advocate for similar initiatives [5].