About SAKAI Naoki
About Univ. Tsukuba, Ibaraki, JPN
About Journal of Developments in Sustainable Agriculture
About sustainable agriculture
About society
About recycle
About environmental conservation
About resource recycling
About sustainable development
About definition
About report
About sustainable society
About Agriculture in general
About 持続可能な農業
About 科学
About 基礎
About 現状