| about the cause | 19 | other |
| for half a century | 10 | temporal |
| recently | 9 | temporal |
| scientist → be → unsure | 201 |
| scientist → be → uncertain | 72 |
| scientist → be → uncertainty | 3 |
| negative | neutral | positive |
| 0.382 | 0.564 | 0.054 |
| Raw frequency | 276 |
| Normalized frequency | 0.798 |
| Modifier score | 0.710 |
| Perplexity | 151.288 |