| Types | Hydrogen • methanol • ammonia |
| Benefits | Decarbonization of transportation sectors • Hard-to-electrify systems |
| Category | Renewable energy |
| Pioneered | 1970s |
| Derivative | Hydrogen |
| Competitors | Other low-carbon alternatives |
| Global role | Clean energy landscapes integration |
| Primary use | Space travel, transportation |
| Technologies | Electrochemical storage • Photovoltaic cells |
| Research focus | 1970s and 1980s global oil crisis |
