Heterogeneity and its policy implications in GHG emission performance of manufacturing industries

초록

This study aims to explore the changes in the pure GHG emission performance of 11 Korean manufacturing industries to determine whether the green policy was effective in terms of its impact on green productivity. For this purpose, the latest non-radial metafrontier Malmquist CO2 emission performance index (NMMCPI) was used. By using this methodology, technological heterogeneities and slack variables could be incorporated into the previous Malmquist CO2 emission performance index (MCPI). The NMMCPI can be derived by solving several non-radial data envelopment analysis (DEA) models. The NMMCPI is decomposed into three indices; an efficiency change (EC) index, a best-practice gap change (BPC) index, and a technology gap change (TGC) index. By fixing the non-energy inputs, the partial-factor GHG emission performance was measured. Based on the proposed indices, 11 Korean manufacturing industries were analyzed for the period 2011-2016. Empirical results showed an average decrease of 1.5% in the GHG emission performance; the results also revealed variations among industries in EC, BPC and TGC. In addition, it was found that the productivity of each industry is driven mainly by a different factor. Thus, policymakers should consider these factors and propose policies that will support the specific requirements in each industry.

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