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].

Group 1 - Brazilian oil company announced an investment of 21 million reais (approximately 28 million RMB) to support social and environmental projects in São Paulo and Rio Grande do Sul states, focusing on climate crisis response and enhancing urban and community resilience [1] - The projects will prioritize areas threatened by extreme weather events such as floods, droughts, and landslides, particularly in cities vulnerable to such conditions [1] - Recent natural disasters in Rio Grande do Sul and São Paulo have highlighted the need for these initiatives, with severe flooding in 2024 resulting in over 100 deaths and more than 500,000 people displaced [1] Group 2 - The project was officially announced during the "Climate Governance Seminar" and the "Second Green Resilient Cities Conference" organized by the Brazilian Ministry of Environment [2]