Against the background of rapid economic development and rapid urbanization, China has become the world's largest energy consumer. It is a consensus that measures to address climate change can effectively improve air quality. What effects have been achieved by China's clean air measures in recent years? Recently, the research group of Professor Zhang Qiang of the Department of earth system science of Tsinghua University published a paper on nature · communication online, which quantitatively analyzed the coordinated emission reduction contribution of China's clean air action to carbon dioxide emissions from 2013 to 2020. Research shows that clean air action has promoted the transformation of China's energy system by eliminating or upgrading backward combustion facilities with low energy efficiency and high pollution. During the above-mentioned period, the carbon synergistic emission reduction brought by the implementation of China's clean air action measures far exceeded the additional carbon dioxide emissions caused by the installation of pollution end treatment devices, achieving a cumulative synergistic emission reduction of 2.43 billion tons, exceeding the cumulative increase of China's carbon dioxide emissions (2.03 billion tons) in the same period, and bringing considerable climate benefits. "Clean air action can generate carbon synergistic emission reduction benefits by affecting the energy system. China's clean air action involves measures to control the total energy consumption, adjust the energy structure and improve energy efficiency, which has produced significant carbon synergistic emission reduction benefits by reducing fossil fuel consumption." Zhang Qiang introduced that in the past, relevant studies on the impact of clean air actions on climate change mainly focused on climate factors such as radiation feedback changes caused by air pollution. Only a few studies have measured the carbon coordinated emission reduction benefits brought by the implementation of clean air actions in key areas. No study has quantified the coordinated emission reduction contribution of China's clean air actions to the national carbon emissions since the implementation of the action plan for air pollution prevention and control in 2013, And from the perspective of measures to carry out in-depth analysis. In view of this problem, the research team reviewed and sorted out five coordinated emission reduction measures in China's clean air campaign, including the elimination of backward production capacity, the remediation of industrial coal-fired boilers, the clean replacement of civilian bulk coal, the remediation of "scattered pollution" and the elimination of yellow label vehicles and old vehicles. Based on the independently developed China multi-scale emission inventory model, Quantifies the changes in energy supply and consumption structure brought by various coordinated emission reduction measures, and finally calculates the carbon emission reduction synergy benefits generated by clean air action. The results show that China's clean air action has promoted the process of replacing inefficient and high-carbon energy facilities with clean and efficient energy facilities, and accelerated the improvement of energy efficiency, the transformation of energy structure and industrial structure. Through the implementation of the clean air initiative, a total of 1.06 billion tons of standard coal were saved and 2.43 billion tons of carbon dioxide were reduced from 2013 to 2020, accounting for 3.1% of China's cumulative carbon emissions during that period; Among them, 247 million tons of standard coal will be saved and 570 million tons of carbon dioxide will be reduced in 2020, accounting for 5.5% of the total national carbon emissions in that year. Although the collaborative emission reduction effect of clean air action is remarkable, the research team believes that China still needs to further optimize its energy system and economic structure to promote the realization of the carbon peak and carbon neutrality goals. "When designing emission reduction policies in the future, we should focus on relevant measures with significant carbon synergistic emission reduction benefits." Zhang Qiang said that this collaborative emission reduction experience also provides