Bagasse - Solid biofuel made from unused remains of crops, e.g. corn, Methane - Gaseous biofuel collected from rotting waste, Ethanol - Liquid biofuel made from corn or potato crops, Hydrogen  - Gaseous biofuel made from chemically treating methane, Biodiesel - Liquid biofuel made from algae, Coal - Solid fossil fuel made from ancient dead swamp plants being compressed, Oil - Liquid fossil fuel made from ancient dead sea life being compressed and undergoing reactions, Natural gas - Gaseous fossil fuel made from ancient dead sea life being compressed and undergoing reactions, Peat - Solid foil fuel made from ancient dead swamp plants being compressed (early stages) ,

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