| Similarity | Rank | |
|---|---|---|
| environmental | 0.745 | 1795 |
| transboundary | 0.729 | 87423 |
| energy-related | 0.718 | 86604 |
| weather-related | 0.699 | 84064 |
| ecological | 0.672 | 9588 |
| pollution | 0.671 | 5841 |
| groundwater | 0.671 | 17131 |
| impacts | 0.669 | 5402 |
| biodiversity | 0.665 | 13376 |
| watersheds | 0.665 | 41406 |
| hydrological | 0.661 | 62436 |
| desertification | 0.660 | 69099 |
| watershed | 0.659 | 17165 |
| ecosystems | 0.654 | 13909 |
| wetlands | 0.649 | 14228 |
| aquatic | 0.643 | 14757 |
| food-related | 0.642 | 80019 |
| hydrologic | 0.641 | 70564 |
| estuarine | 0.638 | 74970 |
| sanitation | 0.635 | 16338 |
| hydrology | 0.633 | 60846 |
| wetland | 0.632 | 19211 |
| mitigation | 0.630 | 14953 |
| disasters | 0.630 | 10143 |
| hazards | 0.629 | 9807 |