| environmentally | 11 | degree |
| with high energy density | 4 | other |
| thanks to this direct conversion | 4 | cause |
| fuel cell → be → friendly | 13 |
| fuel cell → be regarded as → environmentally-friendly devices | 3 |
| negative | neutral | positive |
| 0.044 | 0.209 | 0.747 |
| Raw frequency | 16 |
| Normalized frequency | 0.336 |
| Modifier score | 0.500 |
| Perplexity | 404.902 |