And another few thoughts about coal after reading something about coal dust today.
1. Even the poorer varieties of coal are still useful for heating a boiler.
2. It is, relatively speaking, easier to collect than alcohol.
3. Coal dust can be made into a paste that can be formed into pellets or briquettes so you're not wasting otherwise useful material. The coal paste can either use something like wallpaper paste or other starch type glues as a binding agent. If you don't have access to such glues, you can use sawdust or rice husks - add water then mix the dust & husks/sawdust into a thick paste, place the paste into a mould, add a weight of some kind to press the mix and then leave to dry. If kept dry they have a decent shelf life.
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