Paris is using a chilled-water network supplied by the Seine to help cool parts of the city during periods of extreme heat. Multiple outlets describe a system that circulates water through extensive underground piping. The water is chilled at dedicated plants before it is distributed across Paris through a large network of pipes. The approach is presented as an alternative to conventional air conditioning, aiming to reduce the need for direct, highly energy-intensive cooling. The coverage emphasizes both the scale of the infrastructure and the method of producing chilled water centrally and then transporting it to where cooling is needed. In describing how it works, sources say the network can deliver cooled water over many miles, with the pipes acting as a “labyrinth” beneath the city. While details such as the exact sites served are not covered in the provided excerpts, the reporting converges on the same core points: the Seine-related water supply, centralized chilling, and citywide distribution through a long pipe system designed to improve thermal comfort during scorching weather.