In Japan, about 72% of chlorine contained in PVC wastes is discharged back to the environment. As a result, there is a large potential to recycle chorine from PVC wastes to reduce dependency in salt importation meanwhile it will avoid the formation of corrosive HCl and dioxin. Authors have developed a chlorine recovery (Cl-R) process for PVC wastes to suggest a sustainable chlorine cycle. High dechlorination yield and considerable chlorine recovery potential have been determined by previous works. In this study, the Energy consumption and CO₂ emission balance of current PVC waste treatments were researched to shed light on the benchmark for the new process. Through modification based on the data of mixed plastic waste treatment, we conclude that the net energy balance is -14.5 MJ/ kg PVC waste and the net CO₂ emission is -0.03 kg/ kg PVC waste. This result reveals that energy could be saved through PVC recycling but current PVC waste treatment doesn’t help too much in CO₂ reduction. Therefore, the application of advanced PVC waste treatment may be more desirable. The energy consumption and corresponding CO₂ emission of the potential cycle are excepted to lower than the current situation.