Charcoal

Charcoal has a higher calorific value than wood, meaning it produces more heat per unit mass.
– Charcoal does not produce smoke while burning, whereas wood produces a lot of smoke and pollutes the air.
– Charcoal is a compact fuel that is easy to handle and convenient to use.
– Charcoal can be used to produce gaseous and liquid fuels that can be easily transported and stored.