In the value chain of plastics, scope 3 downstream emissions (2.7 ton CO2 per ton of plastics), which are generated primarily from end-of-life incineration, are known to be particularly high (compared to scope 3 upstream emissions of 0.3 ton and scope 1 and 2 emissions of 2.0 ton, for a total of 5.0 ton CO2 per ton of plastics) (Material Economics 2019). Furthermore, there is a concern that scope 3 upstream emissions (mainly methane leakage) may be underestimated . Therefore, it is essential to manage scope 3 emissions using alternative feedstocks, CCS, or CCU.