| Similarity | Rank | |
|---|---|---|
| biomass | 0.858 | 16091 |
| Biofuels | 0.852 | 67613 |
| Renewable | 0.843 | 19768 |
| Renewables | 0.822 | 55257 |
| Geothermal | 0.794 | 51004 |
| Fuels | 0.790 | 48822 |
| gasification | 0.789 | 64900 |
| biogas | 0.787 | 44510 |
| Biodiesel | 0.784 | 63631 |
| Composting | 0.768 | 63833 |
| Photovoltaic | 0.762 | 65567 |
| cogeneration | 0.761 | 76666 |
| biochar | 0.760 | 81934 |
| bioenergy | 0.759 | 65798 |
| Ethanol | 0.752 | 51076 |
| renewable | 0.752 | 6153 |
| Turbines | 0.745 | 90319 |
| Methane | 0.739 | 69623 |
| Energy | 0.738 | 2769 |
| Waste | 0.737 | 13424 |
| Greenhouse | 0.735 | 32981 |
| Combustion | 0.733 | 74853 |
| digester | 0.722 | 85063 |
| biofuels | 0.722 | 26111 |
| biofuel | 0.721 | 33305 |