| Similarity | Rank | |
|---|---|---|
| ecology | 0.757 | 8063 |
| ecosystem | 0.745 | 13337 |
| environmental | 0.735 | 1300 |
| desertification | 0.715 | 27119 |
| biodiversity | 0.707 | 24873 |
| climatic | 0.700 | 9898 |
| over-exploitation | 0.682 | 57939 |
| biosphere | 0.679 | 29495 |
| habitat | 0.678 | 4730 |
| over-grazing | 0.676 | 73877 |
| reforestation | 0.670 | 43916 |
| conservation | 0.667 | 2346 |
| land-use | 0.665 | 20015 |
| diversity | 0.660 | 4739 |
| overexploitation | 0.659 | 92781 |
| peatbog | 0.657 | 99210 |
| deforestation | 0.649 | 16781 |
| korup | 0.644 | 71899 |
| biogeochemical | 0.642 | 71552 |
| biotic | 0.641 | 31667 |
| biota | 0.641 | 66177 |
| pantanal | 0.641 | 88557 |
| baiji | 0.637 | 65697 |
| birdlife | 0.635 | 45661 |
| over-population | 0.634 | 56522 |