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An alternative source of methane that can also reduce the greenhouse gas effect is one that comes from the upgrading of biogas. This paper studies eight technologies through life cycle assessment (LCA). Six of the technologies are ones that are already on the market and the two others are novel technologies that use carbon mineralization to store CO₂ upon their removal. The two novel technologies include alkaline with regeneration (AwR) and bottom ash upgrading (BABIU). These technologies use waste rich in calcium, from municipal solid waste incinerators (MSWI), to store the CO₂ from biogas. Among all conventional technologies, high pressure water scrubbing and chemical scrubbing with amine had the lowest CO₂ impacts. Of the novel technologies BABIU saves 10% more CO₂ than AwR. An uncertainty analysis and a material flow analysis demonstrated that proximity to a MSWI is an important factor to …