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- environmental aspects (8)
- economic aspects (6)
- power resources (6)
- renewable energy sources (6)
- 研究 (6)
- sustainable development (5)
- energy industries (4)
- history (4)
- climatic changes (3)
- energy conservation (3)
- energy policy (3)
- global warming (3)
- law and legislation (3)
- 能源发展 (3)
- biomass energy (2)
- biotechnology (2)
- coal (2)
- energy consumption (2)
- environmental policy (2)
- environmental sciences (2)
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