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We all reach for the AC when temperatures soar past 35 degrees. But in one Chinese city, residents are trying something different. In Xuzhou, homes are being cooled with cold water pumped from an abandoned coal mine deep underground. No hot exhaust on the streets. No overworked power grid. Just a smart, low-carbon solution that could change how we think about staying cool in a warming world. On the show: Steve, Fei Fei & Yushan
