Core Viewpoint - The 15th National Games, held in the Guangdong-Hong Kong-Macao Greater Bay Area, aimed to create a "carbon-neutral" event through systematic innovation practices, adhering to the principles of "green, shared, open, and clean" [1] Group 1: Utilization of Existing Facilities - The Guangzhou Tianhe Sports Center underwent low-carbon renovation, becoming the first near-zero carbon large sports venue in China, hosting various events [2] - Over 90% of venues in the Guangdong region were upgraded from existing facilities, avoiding new construction and associated carbon emissions [2] - The Hong Kong region utilized existing venues like the Kai Tak Sports Park and others to host multiple events, while Macau also leveraged local educational and recreational facilities [2] Group 2: Post-Event Utilization - The event's low-carbon practices extend beyond the event period, ensuring venues continue to serve urban development and public fitness, preventing resource wastage [3] - For instance, the Shenzhen Longhua Cultural and Sports Center will be open to the public post-event, and the Guangzhou University Town Sports Center will transform into a youth climbing base [3] Group 3: Technological Integration - Main venues and youth sports fields were equipped with rainwater collection systems and solar panels, contributing to sustainability [4] - The Guangdong Olympic Sports Center was modified to enhance natural ventilation and reduce heat gain, while the Macau Taishi Sports Center incorporated natural lighting and energy-saving systems to lower carbon emissions by 30% [4] - A cooling coating technology developed in Hong Kong was successfully applied in venues across Guangdong, showcasing collaborative innovation [5] Group 4: Comprehensive Support Services - Event uniforms and catering materials were made from environmentally friendly materials, and electronic processes were implemented to reduce paper usage [6] - Over 800 electric vehicles were deployed in the Guangzhou region, achieving a green travel rate of over 77% in urban areas, with similar initiatives in Hong Kong and Macau [6] Group 5: Public Engagement and Carbon Management - The Hong Kong government promoted public participation in low-carbon actions through guidelines and interactive exhibits during the event [7] - Shenzhen introduced a carbon emission accounting system for large events, with major companies donating 100,000 tons of carbon assets to offset emissions [7]

Core Viewpoint - The construction of the South Ahmad City infrastructure project in Kuwait focuses on water management, addressing challenges related to groundwater, rainwater, and wastewater treatment [1][2][3]. Group 1: Groundwater Management - The project site has an average of 1-2 meters of groundwater, with seawater intrusion causing significant challenges during construction, including water levels reaching up to 2.5 meters [2]. - Six dewatering solutions were developed to manage groundwater levels, including surface recharge measures to maintain ecological balance and utilize excess water for construction needs [2][3]. Group 2: Rainwater Management - The project incorporates sponge city technology to collect and recycle rainwater, with plans to install approximately 76,009 rainwater collection units and over 264 kilometers of rainwater pipelines [3]. - The rainwater collection system is designed to support irrigation for green spaces, with a capacity to provide enough water for 50 acres of vegetation for a year after a single collection [3]. Group 3: Wastewater Management - The project will provide modern living conditions for at least 100,000 residents, integrating wastewater treatment and reuse into its design [3][4]. - Over 260 kilometers of wastewater pipelines will be installed, with a treatment capacity exceeding 50,000 cubic meters, allowing treated wastewater to be used for irrigation [3][4]. Group 4: Project Scale and Impact - The South Ahmad City infrastructure project covers an area of approximately 52.79 square kilometers and employs over 1,400 workers [4]. - The timely completion of the project is expected to alleviate housing pressure in the old Ahmad area, enhancing the living environment for local residents [4].