From Wikipedia, the free encyclopedia
Jump to: navigation, search
          This article is of interest to the following WikiProjects:
Wikipedia CD Selection
WikiProject icon Biofuel is included in the Wikipedia CD Selection, see Biofuel at Schools Wikipedia. Please maintain high quality standards; if you are an established editor your last version in the article history may be used so please don't leave the article with unresolved issues, and make an extra effort to include free images, because non-free images cannot be used on the DVDs.
WikiProject Environment (Rated B-class)
WikiProject icon This environment-related article is part of the WikiProject Environment to improve Wikipedia's coverage of the environment. The aim is to write neutral and well-referenced articles on environment-related topics, as well as to ensure that environment articles are properly categorized.
Read Wikipedia:Contributing FAQ and leave any messages at the project talk page.
B-Class article B  This article has been rated as B-Class on the project's quality scale.
 ???  This article has not yet received a rating on the project's importance scale.
WikiProject Energy (Rated B-class, High-importance)
WikiProject icon This article is within the scope of WikiProject Energy, a collaborative effort to improve the coverage of Energy on Wikipedia. If you would like to participate, please visit the project page, where you can join the discussion and see a list of open tasks.
B-Class article B  This article has been rated as B-Class on the project's quality scale.
 High  This article has been rated as High-importance on the project's importance scale.

Added info[edit]

Pure (compressed) methane wasn't described, so I changed the biogas section to: ====Biogas and methane==== [[Image:Biogas pipes.JPG|right|thumb|150px|Pipes carrying biogas]] {{Main|Biogas}} Biogas is a gas produced by the process of [[anaerobic digestion]] of [[organic material]] by [[anaerobe]]s.<ref>Redman, G., The Andersons Centre. [;isa=DBRow;op=show;dbview_id=2457 "Assessment of on-farm AD in the UK"], ''[[National Non-Food Crops Centre]]'', 2008-06-09. Retrieved on 2009-05-11.</ref> Methane is a purer gas (biogas being composed of methane and CO<sub>2</sub> and thus energy denser.<ref>[ Using methane for transport purposes]</ref> Both can be produced either from [[biodegradable waste]] materials or by the use of [[energy crop]]s fed into [[anaerobic digester]]s to supplement gas yields. The solid byproduct, [[digestate]], can be used as a biofuel or a fertilizer. One disadvantage of both fuels however is that they need to be compressed in order to be useful as a vehicle fuel (not needed for stationary applications). The compression itself however generally also requires allot of energy. * Biogas can be recovered from [[mechanical biological treatment]] waste processing systems. :Note:[[Landfill gas]] is a less clean form of biogas which is produced in [[landfill]]s through naturally occurring anaerobic digestion. If it escapes into the atmosphere it is a potential [[greenhouse gas]]. * Farmers can produce biogas and methane from [[manure]] from their cows by using an anaerobic digester (AD).<ref>"BIOGAS: No bull, manure can power your farm." Farmers Guardian (September 25, 2009): 12. General OneFile. Gale.</ref>

sustainable biofuels[edit]

thanks magnolia for your pointing out the invalidity of the source I cited. Still think the edit was valid; biofuels have been under considerable scientific scrutiny lately, and the sources that were cited by the original editor were even worse (an op-ed by a stakeholder), while the article I based myself upon was written by a sound scientist. Now added better refs. Sven Jense (talk) 18:27, 23 July 2014 (UTC)

You added the same bogus reference, plus an abstract to a pay-per-view journal--and the abstract doesn't even support your edit. The point you are trying to make seems valid, and it shouldn't be too hard to find a reliable source or two. But adding fake references kinda seems like vandalism, and it certainly doesn't help the young people who use articles like this for their research papers. Magnolia677 (talk) 20:11, 23 July 2014 (UTC)
Thanks for your feedback. I propose adding these references. Please let me know what you think.
Sven Jense (talk) 20:48, 23 July 2014 (UTC)
The first ref is some random blog. Not a reliable source. The 2nd ref is about an annex that was stripped out of a EU community report because "The analysis prepared under this study applied a methodology which by many is not considered appropriate." This is not what you want to reach for, to get a clear understanding of the scientific consensus (and range of alternative ideas) on this subject. The third is an opinion piece that holds up a WP:CRYSTALBALL with a lot of what-ifs. We don't do crystal ball here. Please see WP:SCIRS for a guide to what kind of sources are appropriate on these issues. Thanks. Jytdog (talk) 21:00, 23 July 2014 (UTC)
I can not find a more reliable source in a journal that is freely available. As an alternative I delete the last paragraph of the article as it contains invalid information and is supported only by a non-reliable source (an opinion voiced by a stakeholder in the biofuel industry).Sven Jense (talk) 11:20, 28 July 2014 (UTC)

Energy Quotient (Ratio)[edit]

This describes the ratio of energy input and energy output for each unit of biofuels.

This is really important, as this gives a measure of the overall energy efficiency and sustainability of biofuels.

Carbon Efficiency[edit]

This describes the ratio of net carbon emissions for producing and using a unit of biofuels.

measured as the ratio of, unit of biofuels / net carbon emissions

This is really important, as this gives a measure of the overall carbon efficiency and sustainability of biofuels.

A really good and sustainable biofuel has a high carbon efficiency and a high energy quotient.

It is really important for this to be compared among all bio-fuels, and among all sources of energy, including wind, solar, hydro, and wave energy.

Ehr1Ros2 (talk) 13:18, 10 October 2014 (UTC)

Thanks for this note. To include this material in WP, it needs to have reliable sources. Please see WP:OR, WP:VERIFY, and WP:RS. thanks! Jytdog (talk) 15:01, 10 October 2014 (UTC)


A study of the European Environmental Agency (Copenhagen, Denmark) has shown that a speed limit of 100/110 km/hr, leads to far larger reductions in carbon emissions, than a 8% mixture of biofuels in petrol or diesel.

A complementary study of the WoodsHole Research Centre (WoodsHole, MA, USA) has shown that exhausts from automobiles are converted by forests and farms into biomass within a fortnight or so. — Preceding unsigned comment added by Ecoanthropology (talkcontribs) 06:41, 14 October 2014 (UTC)

can't use that without a source...Jytdog (talk) 11:23, 14 October 2014 (UTC)

Unsupported value judgement[edit]

For practical terms this has no big implications as the typical driver does not use up a full tank in one trip. (E.g. European citizens drive on average less than 20 km/day).

I removed this statement since it is asking the reader to accept a subjective criterion of practicality or palatability -- it seems to be trying to "persuade" him of something, like in a Sunday magazine article.

It is little better than arguing that a 30% increase (in some driving-related cost) does not matter in practical terms because "people don't really drive that much".

Best let the 30% speak for itself. (talk) 08:17, 11 January 2015 (UTC)