| Similarity | Rank | |
|---|---|---|
| deforestation | 0.863 | 16781 |
| over-grazing | 0.809 | 73877 |
| salinisation | 0.808 | 55212 |
| overgrazing | 0.807 | 43790 |
| sahel | 0.807 | 34491 |
| aral | 0.792 | 56674 |
| climatic | 0.788 | 9898 |
| icecap | 0.785 | 88649 |
| cropland | 0.779 | 67849 |
| overgrazed | 0.779 | 82229 |
| peatbog | 0.773 | 99210 |
| species-rich | 0.773 | 57871 |
| ecosystem | 0.772 | 13337 |
| high-latitude | 0.772 | 67674 |
| amazonia | 0.768 | 25488 |
| tropospheric | 0.765 | 67421 |
| siltation | 0.765 | 76239 |
| biota | 0.763 | 66177 |
| post-glacial | 0.763 | 38769 |
| eutrophication | 0.757 | 42648 |
| acidification | 0.756 | 21870 |
| permafrost | 0.754 | 45630 |
| subtropics | 0.753 | 64359 |
| deforest | 0.752 | 58272 |
| erosion | 0.752 | 5070 |