Editing Biogas (section)

==== Key processes ====
There are two key processes: [[mesophilic]] and [[thermophilic]] digestion which is dependent on temperature. In experimental work at [[University of Alaska Fairbanks]], a 1000-litre digester using [[psychrophiles]] harvested from "mud from a frozen lake in Alaska" has produced 200–300&nbsp;liters of methane per day, about 20–30% of the output from digesters in warmer climates.<ref name="NewSc2785p14">{{cite news |last=Gupta |first=Sujata |date=2010-11-03 |title=Cold climates no bar to biogas production |url=https://www.newscientist.com/article/mg20827854.000-cold-climates-no-bar-to-biogas-production.html |access-date= |newspaper=New Scientist |publisher=Sunita Harrington |location=London |pages=14}}</ref>