中古車貿易に伴う金属資源の国際流動

抄録

  This paper examines the traceability of resource movement across borders by quantifying the global flow of base metals (Fe, Al, Cu, Pb, and Zn) through the used passenger car trade in 2005 using trade statistics and vehicle composition data. An estimation method was developed to deal with the often problematic issues associated with trade statistics. This estimation shows that 3.4×10⁶ metric tons of Fe, 3.1×10⁵ metric tons of Al, 7.5×10⁴ metric tons of Cu, 3.2×10⁴ metric tons of Pb, and 2.7×10⁴ metric tons of Zn in used passenger cars globally were not recycled in the country of origin, but rather moved in a global flow out of the country of manufacture. The destinations of these metals were mainly developing countries with rudimentary recycling technology. These results strongly indicate that in developed countries, many metal resources from automobiles that could have been utilized domestically were instead scattered and lost overseas.