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| 《21世纪议程》 (为1992年在里约热内卢召开的联合国环境与发展大会通过的文件，其中第二部分第12章为"脆弱生态系统的合理利用:防治干旱和荒漠化") | |||
| 21世纪议程指1992年在巴西的里约热内卢召开的“地球峰会”发表的《里约环境与发展宣言》中 | |||
| 21世纪议程; 21世纪议程：可持续发展行动纲领 | |||
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Agenda 21 : 8 phrases in 2 subjects |
| Ecology | 1 |
| United Nations | 7 |
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