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- climatic changes (12)
- global environmental change (11)
- environmental aspects (9)
- environmental policy (9)
- global warming (5)
- government policy (5)
- political aspects (5)
- 研究 (5)
- economic aspects (4)
- environmental protection (4)
- globalization (4)
- international cooperation (4)
- history (3)
- social aspects (3)
- sustainable development (3)
- technological innovations (3)
- water-supply (3)
- 全球环境 (3)
- 环境影响 (3)
- arctic regions (2)
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