| Similarity | Rank | |
|---|---|---|
| fracking | 0.847 | 21463 |
| Shale | 0.707 | 29866 |
| fracturing | 0.695 | 29911 |
| Spill | 0.691 | 49982 |
| Environmentalists | 0.680 | 69122 |
| oilsands | 0.665 | 96475 |
| Sequestration | 0.659 | 89922 |
| Sludge | 0.658 | 98368 |
| Drilling | 0.655 | 33103 |
| Pipelines | 0.653 | 91389 |
| Warming | 0.650 | 29245 |
| Flooding | 0.648 | 61326 |
| Methane | 0.647 | 69623 |
| Ethanol | 0.645 | 51076 |
| Marcellus | 0.642 | 34448 |
| Biofuels | 0.642 | 67613 |
| Pollution | 0.640 | 29306 |
| CSG | 0.640 | 64462 |
| Landfill | 0.637 | 57827 |
| Sewage | 0.634 | 66452 |
| Fuels | 0.633 | 48822 |
| Blasting | 0.630 | 95729 |
| Enbridge | 0.630 | 59217 |
| Groundwater | 0.629 | 66053 |
| Waste | 0.627 | 13424 |