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- environmental policy (8)
- environmental protection (8)
- 环境保护 (6)
- 可持续性发展 (5)
- environmental aspects (4)
- sustainable development (4)
- 教材 (4)
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- environmental management (3)
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- planning (3)
- environmentalism (2)
- social aspects (2)
- blue nile river (ethiopia and sudan) (1)
- business & economics / development / economic development (1)
- business & economics / development / sustainable development (1)
- business & economics / environmental economics (1)
- computer simulation (1)
- conservation of natural resources (1)
- control (1)
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