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- biomass energy (12)
- environmental aspects (8)
- renewable energy sources (8)
- materials (7)
- energy conservation (4)
- nanostructured materials (4)
- power resources (4)
- sustainable engineering (4)
- water (4)
- environmental chemistry (3)
- fuel (3)
- government policy (3)
- hydrogen as fuel (3)
- industrial applications (3)
- purification (3)
- technological innovations (3)
- waste products as fuel (3)
- automobiles (2)
- biomass conversion (2)
- biotechnology (2)
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