Carbon trading is a kind of virtual trading based on the provisions of the United Nations Framework Convention on Climate Change and the Kyoto Protocol on the allocation of carbon dioxide emission targets among countries. It is the only way to lead the development of low-carbon economy by the market mechanism.

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Since the launch of the EU ETS in 2005, emissions trading systems are spreading around the world. The number of global emissions under emissions trading will increase by almost 70% in 2020 compared to 2019. (International Carbon Action Partnership (ICAP) –Status Report 2019) It is predicted that carbon price will rise above 60 USD/tCO2 by 2025. (Carbon Price Leadership Coalition (2017), Report of the High Level Commission on Carbon Prices)