FILE - In this Nov. 28, 2019, file photo, smoke and steam rise from a coal processing plant in Hejin in central China's Shanxi Province. Chinese power companies bid for credits to emit carbon dioxide and other climate-changing gases as trading on the first national carbon exchange began Friday, July 16, 2021 in a step meant to help curb worsening pollution. (AP Photo/Olivia Zhang, File)
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