Comparison of “CO2 efficiency” between company and industry

Abstract The concept of eco-efficiency, product or service value per environmental influence, was applied to define “total CO 2 efficiency”, “direct CO 2 efficiency” and “indirect CO 2 efficiency” using Input–Output (I–O) table analysis for the evaluation of companies and industries. The result shows that the analysis of the efficiency was useful to characterize industries according to CO 2 efficiency. The comparison of company-based CO 2 efficiency against I–O-based CO 2 efficiency was possible for beer companies and petroleum companies because they almost completely belong to a single type of industry sectors. However, generally such comparison was difficult for the companies that belong to many industry sectors. Therefore, we proposed the new method “integrated CO 2 efficiency index for company evaluation (ICEICE)” which makes it possible to compare the environmental performances of all the companies regardless of the number of industry sectors they belong to.