1. Research Center for Life Cycle Assessment, National Institute of Advanced Industrial Science and Technology (AIST), 16-1 Onogawa, Tsukuba, Ibaraki 305-8569, Japan, and Faculty of Environmental and Information Studies, Musashi Institute of Technology, 3-3-1 Ushikubo-Nishi, Tsuzuki-ku, Yokohama, Kanagawa, Japan