日本語 Commissioned Report Commissioned Report Author: Masanori KOBAYASHI Masahiro TAKAHASHI Maiko YOSHIZAWA Date: March 2008 Copyright: Ministry of the Environment Japan Languages: 日本語 Author: Masanori KOBAYASHI Masahiro TAKAHASHI Maiko YOSHIZAWA Contributor: Ikuyo KIKUSAWA Publication Date: March 2008