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01.12.2016 | Research | Ausgabe 1/2016 Open Access

Journal of Economic Structures 1/2016

Consumption-based accounting of steel alloying elements and greenhouse gas emissions associated with the metal use: the case of Japan

Zeitschrift:
Journal of Economic Structures > Ausgabe 1/2016
Autoren:
Hajime Ohno, Kazuyo Matsubae, Kenichi Nakajima, Keisuke Nansai, Yasuhiro Fukushima, Tetsuya Nagasaka
Wichtige Hinweise

Electronic supplementary material

The online version of this article (doi:10.​1186/​s40008-016-0060-9) contains supplementary material, which is available to authorized users.

Abstract

Metal extraction and smelting cause considerable impacts on the environment. Consumption-based impact accounting highlights the responsibility of metal-consuming industries for the impacts and may drive a system-wide improvement in the structure of related supply chains. To drive the improvements, policies at national level coordinated for respective product types across the nations is needed. However, nationwide responsibility for specific use of metals is difficult to identify because metals are manufactured into composite products (e.g., vehicles) in a country that is in many cases, different from the country where mining is practiced. The final product environmental footprints would not reveal the location where the various impacts are caused. This study presents a method to support the policy coordination by identifying the magnitude of the responsibility of metal-consuming countries for environmental impacts occurred in mining countries so that the countries sharing large responsibilities can find partner countries to jointly work on reduction in environmental impacts effectively. An input–output-based material flow analysis model is used to track the flows of metals included in products made in Japan throughout the international supply chain. In 2005, Japanese industries collected steel alloying elements (manganese, chromium, nickel, molybdenum) embodying 3200 kt-CO2eq and distributed them as both intermediate and final products. For steel mill products, Asian countries were the main destination, while alloying elements contained in other products were relatively evenly exported to Asia, Europe, and North America. By consuming products made in Japan, South Korea, China, the USA, and Taiwan shared approximately 10% each in terms of share of responsibility for greenhouse gas emission embodied in alloying element collected by Japan. Japan shared 40% of the responsibility with domestic consumption of own products. These findings suggest that Japan, a collector and distributor of steel alloying elements, must work on its own resource use reduction policies coordinating with these countries to globally develop sustainable resource use system.

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Zusatzmaterial
Additional file 1. List of commodities considered in the analysis.
Additional file 2. Top 10 countries in terms of accompanying mass of allying elements with steel mill products and other products except for raw materials.
Literatur
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