| Similarity | Rank | |
|---|---|---|
| fossil-fuel | 0.797 | 91442 |
| non-renewable | 0.775 | 56124 |
| fuels | 0.747 | 9417 |
| carbon-based | 0.745 | 97409 |
| methane | 0.718 | 19799 |
| fossils | 0.717 | 23150 |
| Fossil | 0.707 | 37061 |
| biomass | 0.701 | 16091 |
| anthropogenic | 0.690 | 46957 |
| coal | 0.689 | 5233 |
| fossilized | 0.688 | 60659 |
| biofuels | 0.676 | 26111 |
| shale | 0.675 | 17984 |
| carbon | 0.663 | 3087 |
| biofuel | 0.662 | 33305 |
| thorium | 0.661 | 70297 |
| hominid | 0.657 | 82094 |
| deforestation | 0.648 | 27552 |
| hydrocarbon | 0.647 | 36213 |
| hydrocarbons | 0.645 | 32458 |
| earths | 0.643 | 47315 |
| hominids | 0.642 | 99822 |
| extinctions | 0.640 | 71406 |
| feedstocks | 0.637 | 76964 |
| emissions | 0.631 | 4569 |