Development of environmentally extended input-output model tailored for RME calculation
Charles University Environment Center, Czech Republic
Economy-wide material flow accounting (EW-MFA) is considered a convenient tool for resource efficiency, decoupling and recycling analyses and related resource management policies. Material flows embodied in international trade (raw material equivalents of imports and exports, RME) are used for assessment of shifts of environmental impacts between countries and assessment of foreign trade resource dependencies. This poster presents the development of environmentally extended input-output model tailored for RME calculation. The model developed in previous years was taken as a starting point and was improved by further sectoral disaggregation, precision of LCI-based information for RME of metal ores and basic metals, hybridization of selected product groups, revaluation of imports at domestic prices and adding additional information on recycling ratios for metal imports and on energy mix of imports of electricity.
The improvements described above was tested for year 2010 and the Czech Republic and showed a significant difference in results compared to original model. The disaggregation increased total RME of imports by less than 1%, but the increase was 165% for industrial non-metallic minerals, for instance. Improvement of LCI-based information led to a further decrease of 45% in total RME of imports and the change was most significant for metal ores (a decrease by 72%). Hybridization decreased the results for total RME of imports by 10% (most for construction non-metallic minerals) while combined revaluation of imports at domestic prices and adding additional information on recycling ratios for indirect metal imports and on energy mix of direct and indirect imports of electricity further increased the results by 3% (most for brown coal). The total change after application of all the improvements was -49% in total RME of imports. These changes are significant and proves that the improvements are not of a cosmetic character only.