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Rising River Temperatures Threaten Paris's Water-Based Building Cooling Network

2 months ago
Networks of pipes and heat exchangers can transfer excess heat from buildings into nearby bodies of water -- but as the world warms, the cooling potential of some water courses is now diminishing, Wired reports. Paris's district cooling network, which pipes Seine river water to cool 800 buildings including the Louvre Museum, faces diminishing returns as climate change warms water temperatures. The system achieves coefficients of performance between 4 and 15 -- significantly higher than conventional air conditioning -- by transferring building heat through heat exchangers to the river. The Seine briefly exceeded 27C this summer, approaching the 30C regulatory limit for returned water. The network currently spans 100 kilometers of pipes and will expand to 245 kilometers by 2042 to serve 3,000 buildings. Similar installations operate in Toronto using lake water from 83-meter depths and at Cornell University drawing 4C water from Lake Cayuga at 76 meters. Rotterdam and other cities are developing comparable systems as cooling demand rises.

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Columbia Tries Using AI To Cool Off Student Tensions

2 months ago
An anonymous reader shares a report: Can AI help "smooth over" discussion on abortion, racism, immigration, or Israel-Palestine? Columbia University sure hopes so. The Verge has learned that the university recently began testing Sway, an AI debate program currently in beta. Developed by two researchers at Carnegie Mellon University, Sway matches up students with opposing views to chat one-on-one about hot-button issues and "facilitates better discussions between them," according to the tool's website. Nicholas DiBella, a postdoctoral scholar at CMU who helped develop Sway, told The Verge that about 3,000 students from more than 30 colleges and universities have used the tool. One of those may soon be Columbia. News of the potential partnership comes after more than two years of escalating tensions at Columbia between students, administrators, and the federal government. The university has spent years at the center of controversy after controversy: expulsions of pro-Palestinian student protesters, a string of police raids, and demands from the federal government. People at Columbia's Teachers College are testing Sway in order to potentially integrate it into the conflict resolution curriculum and "bridge-building initiatives at Columbia," DiBella said. He said there's also been interest from other teams at Columbia in using Sway for the fall 2026 semester and onward. Simon Cullen, an assistant professor at CMU and the other developer behind Sway, told The Verge that the company is also in touch with Columbia University Life.

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