*Kentaro Hayashi¹, Hideaki Shibata², Sadao Eguchi¹, Azusa Oita¹, Kazuya Nishina³, Akihiko Ito³, Kiwamu Katagiri⁴, Junko Shindo⁵, Baojing Gu⁶, Wilfried Winiwarter⁷ (1.Institute for Agro-Environmental Sciences, NARO, 2.Hokkaido University, 3.National Institute for Environmental Sciences, 4.Tohoku University, 5.Emeritus, University of Yamanashi, 6.Zhejiang University, 7.International Institute for Applied Systems Analysis)