| from melting permafrost | 18 | location |
| from the decomposition | 10 | other |
| during the drilling | 9 | temporal |
| methane → be → released | 304 |
| methane → gets → released | 4 |
| methane → be released as → gas | 4 |
| methane → be released in → the process | 3 |
| negative | neutral | positive |
| 0.359 | 0.582 | 0.059 |
| Raw frequency | 315 |
| Normalized frequency | 0.986 |
| Modifier score | 0.694 |
| Perplexity | 61.214 |