Bio-methane produced by the natural decay of garbage or agricultural manure can be collected for use as fuel.
It is also possible to estimate the number of animals needed for desirable size of biogas driven engine with Biogas Calculator
Wood gas can be extracted from wood and used in petrol engines.
Hydrogen can be produced in water electrolysis or, less ecologically, by cracking any hydrocarbon fuel in a reformer, some fermentation processes also produce hydrogen, such as A.B.E. fermentation.
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