TLDR: Methane is flammable. It is a gas that comes from compost during decomposition (also in farts). If you catch it, you can cook with it like you would propane. Thus if you compost in a container, you have unlimited free fuel.
I know this post is going to get some weird responses so I'll try to get all the nuts and bolts up front.
You can compost human waste and in 1 year it is completely pathogen free and super fertile dirt that can be used on whatever you feel like growing.
There's a cool (albeit unique) way of using composting toilets that saves a bajillion gallons of water every year.
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