| take careful preparation | 0.48 |
| take specialty gear | 0.46 |
| spoil the environment | 0.45 |
| enter the environment | 0.25 |
| discharge into groundwa… | 0.16 |
| exhibit hazardous chara… | 0.16 |
| gas | 0.36 |
| heavy metals | 0.19 |
| liquid | 0.52 |
| waste | 0.52 |
| sludge | 0.37 |
| the subject of provisio… | 0.33 |
| asbestos | 0.30 |
| firework | 0.21 |
| gadget | 0.21 |
| dangerous good | 0.16 |