| Similarity | Rank | |
|---|---|---|
| population_growth | 0.686 | 14508 |
| population_control | 0.674 | 83572 |
| environmental_degradation | 0.639 | 26308 |
| environmental_crisis | 0.623 | 74211 |
| habitat_destruction | 0.619 | 88499 |
| global_warming | 0.601 | 5979 |
| urbanization | 0.588 | 17013 |
| increase_population | 0.587 | 98586 |
| food_shortage | 0.585 | 55387 |
| population_increase | 0.584 | 69748 |
| habitat_loss | 0.583 | 50927 |
| environmental_problem | 0.578 | 25380 |
| urbanisation | 0.574 | 42568 |
| loss_of_biodiversity | 0.570 | 94363 |
| global_climate_change | 0.570 | 29854 |
| urban_sprawl | 0.570 | 60251 |
| human_population | 0.569 | 27420 |
| grow_population | 0.566 | 74300 |
| environmental_destruction | 0.561 | 66724 |
| biodiversity_loss | 0.561 | 86453 |
| overcrowding | 0.558 | 40630 |
| overfishing | 0.556 | 58355 |
| desertification | 0.539 | 42512 |
| environmental_pollution | 0.536 | 52695 |
| climate_change | 0.534 | 1527 |