Editing Alternative technology (section)

=== Anaerobic digestion ===

* Biogas, landfill gas extraction

[[Anaerobic digestion]] is a series of biological processes in which microorganisms break down biodegradable material when there is no oxygen.<ref>{{Cite web|url=https://americanbiogascouncil.org/resources/what-is-anaerobic-digestion/|title=What is Anaerobic Digestion? {{!}} American Biogas Council|last=Dombrowski|first=Brian|date=2018-12-04|language=en-US|access-date=2019-12-12}}</ref> During anaerobic digestion, one of the end products is biogas, which is combusted to generate electricity and heat, or can be processed into renewable natural gas and transportation fuels.<ref>{{Cite web|url=https://americanbiogascouncil.org/resources/what-is-anaerobic-digestion/|title=What is Anaerobic Digestion? {{!}} American Biogas Council|last=Dombrowski|first=Brian|date=2018-12-04|language=en-US|access-date=2019-12-09}}</ref> Anaerobic digestion is considered alternative technology because it is a way to create [[energy]] using materials that can be broken down and reused for something else.