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- social aspects (737)
- environmental aspects (508)
- economic aspects (385)
- psychological aspects (266)
- political aspects (232)
- history (215)
- moral and ethical aspects (173)
- law and legislation (123)
- 研究 (105)
- technological innovations (102)
- health aspects (82)
- united states (81)
- economic development (79)
- pollution (77)
- religious aspects (73)
- sustainable development (73)
- climatic changes (71)
- environmental policy (70)
- globalization (69)
- management (66)
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