| Answer | Crossword Clue |
|---|---|
| PEAT | Vegetable fuel |
| PEAT | Vegetable-matter fuel |
| PEAT | Fuel from vegetable tissue |
| PEAT | Vegetable matter used as fuel |
| COALS | Lumps of mineralized vegetable matter fuel. |
| BIODIESEL | Fuel made from vegetable sources (and a 2006 dictionary addition) |
