| Similarity | Rank | |
|---|---|---|
| combustion | 0.813 | 26558 |
| liquid_fuel | 0.703 | 86707 |
| methane | 0.693 | 14641 |
| carbon_dioxide | 0.693 | 11994 |
| emission_from | 0.673 | 32492 |
| nitrogen_oxide | 0.672 | 78932 |
| of_fossil_fuel | 0.671 | 44531 |
| burning_of | 0.668 | 23384 |
| Co_2 | 0.667 | 19859 |
| NOx | 0.662 | 71494 |
| CO2 | 0.654 | 9699 |
| emission | 0.646 | 4559 |
| fossil_fuel | 0.645 | 9239 |
| Co_2_emission | 0.640 | 88444 |
| carbon_dioxide_emission | 0.638 | 61386 |
| greenhouse_gas | 0.635 | 18514 |
| sulfur_dioxide | 0.632 | 93673 |
| internal_combustion_engine | 0.632 | 72067 |
| air_pollutant | 0.627 | 77087 |
| oxidation_of | 0.626 | 75521 |
| carbon_monoxide | 0.625 | 39006 |
| biomass | 0.625 | 8352 |
| feedstock | 0.622 | 44952 |
| particulate | 0.620 | 43599 |
| soot | 0.619 | 42732 |