Investigating the effect of three international treaties on environmental pollution: Application of Propensity Score Matching

The impact of global climate change warnings and ozone depletion on the global economy has attracted many researchers in recent decades, and many international organizations have taken action in response to these problems, including co-engagement Montreal, Kyoto, and Paris treaties. The purpose of this study was to investigate the relationship between the emission of some pollutants as an indicator of environmental pollution and macroeconomic variables such as energy consumption and foreign trade, and the effects of the obligations of member states in these treaties on the emissions of these pollutants. To this end, the matching approach has been used based on the desirability and regression of the difference-in-difference. The results of the alignment approach indicate a reduction in the emissions of carbon dioxide and total greenhouse gases for the Kyoto Protocol, and for the Montreal Treaty, the results of the alignment approach have contributed to the reduction of pollutants of hydro-fluorocarbons.