Editing Renewable resource (section)

===Biofuel===
{{main|Biofuel}}

[[File:Sao Paulo ethanol pump 04 2008 74 zoom.jpg|thumb|[[Ethanol fuel in Brazil|Brazil]] has [[ethanol fuel|bioethanol]] made from sugarcane available throughout the country. Shown a typical [[Petrobras]] gas station at [[São Paulo]] with dual fuel service, marked A for [[ethanol fuel|alcohol (ethanol)]] and G for gasoline.]]

A biofuel is a type of [[fuel]] whose energy is derived from biological [[carbon fixation]]. Biofuels include fuels derived from [[biomass]] conversion, as well as [[Biofuel#Solid biofuels|solid biomass]], [[liquid fuels]] and various [[biogas]]es.<ref>{{cite journal | title = Biology and genetic improvement of Jatropha curcas L.: A review| journal = [[Applied Energy]] | volume = 87 | issue = 3 | year = 2010| pages = 732–742 |author1=B.N. Divakara |author2=H.D. Upadhyaya |author3=S.P. Wani |author4=C.L. Laxmipathi Gowda | doi = 10.1016/j.apenergy.2009.07.013| bibcode = 2010ApEn...87..732D | url = http://oar.icrisat.org/174/1/nset10.pdf }}</ref>

[[Bioethanol]] is an [[Alcohol (chemistry)|alcohol]] made by [[Ethanol fermentation|fermentation]], mostly from [[carbohydrate]]s produced in [[sugar]] or [[starch]] crops such as [[Maize|corn]], [[sugarcane]] or [[switchgrass]].

[[Biodiesel]] is made from [[vegetable oil]]s and [[animal fat]]s. Biodiesel is produced from oils or fats using [[transesterification]] and is the most common biofuel in Europe.

[[Biogas]] is [[methane]] produced by the process of [[anaerobic digestion]] of [[organic material]] by [[anaerobe]]s.,<ref>Redman, G., The Andersons Centre. [http://www.nnfcc.co.uk/metadot/index.pl?id=7198;isa=DBRow;op=show;dbview_id=2457 "Assessment of on-farm AD in the UK"] {{webarchive|url=https://web.archive.org/web/20101113120322/http://www.nnfcc.co.uk/metadot/index.pl?id=7198%3Bisa%3DDBRow%3Bop%3Dshow%3Bdbview_id%3D2457 |date=2010-11-13 }}, ''[[National Non-Food Crops Centre]]'', 2008-06-09. Retrieved on 2009-05-11.</ref> etc. is also a renewable source of energy.