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China, moving cautiously, starts carbon trading market

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/Sam McNeil, File) 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) The sun sets near a coal-fired power plant on the Yangtze River in Nantong in eastern China's Jiangsu province on Dec. 12, 2018. 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. (Chinatopix via AP)