| http://www.w3.org/ns/prov#value | - The by-product of this digestion, mostly methane gas, is then upgraded to be the equivalent to natural gas, and can be compressed (CNG) or liquefied (LNG)???but unlike natural gas, biogas is renewable because its feedstock comes from a variety of solid wastes, sewage sludge, and manure and other animal by-products.
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