Proceedings of the Fourth International Conference on EcoBalance : methodologies for decision making in a sustainable 21st Century : October 31-November 2, 2000, EPOCHAL TSUKUBA, Tsukuba, Japan - エコバランス国際会議; 未踏科学技術協会; エコマテリアル研究会; LCA日本フォーラム; 日本LCA研究会; 科学技術庁 (Secretariat of the Forth International Conference on EcoBalance : the Society of Non-Traditional Technology, 2000)