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- sustainable development (8)
- environmental aspects (7)
- climatic changes (5)
- economic aspects (4)
- government policy (4)
- emergency management (3)
- environmental policy (3)
- international cooperation (3)
- political aspects (3)
- pollution (3)
- purification (3)
- air (2)
- carbon dioxide mitigation (2)
- disaster relief (2)
- ecology (2)
- environmental economics (2)
- environmental impact analysis (2)
- environmental protection (2)
- environmental sciences (2)
- green chemistry (2)
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