China's first trade fair with the theme of carbon neutrality, the Shanghai International Carbon Neutrality Expo, attracted nearly 600 enterprises from all over the world. The exhibition runs from 11 to 14 June and covers six key areas. China's Emissions Trading System (ETS) has now replaced the EU's as the world's largest emissions trading system, according to the country's Ministry of Ecology and Environment. CGTN's Zheng Chunying explains how carbon trading works.

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