| http://www.w3.org/ns/prov#value | - Coal is a form of biomass that has been compressed over millennia to produce a non-renewable, highly-polluting fossil fuel.Wood and its byproducts can now be converted through process such as gasification into biofuels such as woodgas, biogas, methanol or ethanol fuel; although further development may be required to make these methods affordable and practical.
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