Questions tagged [biofuels]

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What Fraction of Sustainable Aviation Fuel (SAF) is Actually Used Cooking Oil? (Is this fraction itself sustainable?)

The November 23, 2022 CNN article Etihad's 'Greenliner' shows a glimpse of a more sustainable future for aviation includes a photo with the caption: On March 25 2022, an Airbus A380, the world's ...
uhoh's user avatar
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4 votes
1 answer
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Which alternative fuels are practical for cars in Europe? Is there a map of stations?

I am looking for viable options to allow sustainable personal transportation in Europe. For the sake of this question, let us ignore the question of emissions / LCA. The question is the practicality ...
Ixxie's user avatar
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3 votes
3 answers
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Carbon emissions from Ethanol car fuel

I understand that much of the low CO2 emissions for ethanol as vehicle fuel are related to its entire lifecycle (CO2 is sequestrated when the crop is grown and released when it combusts so it is ...
Christopher Gilmour's user avatar
2 votes
2 answers
222 views

Why do some people say that biofuels are renewable energy source if producing biofuels requires nitrogen fertilizers?

Why do some people say that biofuels are renewable energy source if producing biofuels requires nitrogen fertilizers that are produced from natural gas (and energy output of biofuels is less than that ...
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3 votes
3 answers
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Are trees more productive than wind turbines?

Tree farm assumptions: 250,000 square meters (m2) tree farm A 1 ton tree contains 1 MWh of energy Each tree takes 10 m2 of space Total energy for this farm is thus 25 GWh Wind farm assumptions: 5 ...
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4 votes
1 answer
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Will natural gas or propane generators also run off of methane?

I'm looking at building a sustainable energy project that will convert biogas (methane) into electricity. I haven't found any biogas or methane electric generators for sale. It seems that there are ...
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2 votes
2 answers
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How can I separate carbon monoxide from wood gas?

I am thinking about using open source wiki designs from allpowerlabs to construct a wood gas generator. The motivation came from experiencing a 10 day power outage after super storm Sandy. The ...
0tyranny0poverty's user avatar
8 votes
1 answer
360 views

Sustainability of waste incineration vs biofuel/biogas?

Should I encourage my neighbors to send their food waste to a biogas plant instead of the current incineration facility? I have Googled around and it does not seem like it is clear that it is better ...
Uli Alskelung Von Hornbol's user avatar
7 votes
2 answers
229 views

Is using vegetable oil for electricity generation more efficient than burning whole plants?

This question is based on the premise that using "cheap" biofuel in a diesel engine to power a generator (and not using batteries) is better than the alternatives. My understanding is that if you must ...
Móż's user avatar
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5 votes
1 answer
140 views

Does bio jet fuel have a positive energy balance?

This article which was recently trending got me thinking about biofuels: Alaska Airlines makes first flight using jet fuel made from trees. I am not familiar with the numbers for biodiesel, but I ...
LShaver's user avatar
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6 votes
1 answer
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Sources for the carbon impact of US corn ethanol?

I am struggling to find recent sources on the carbon intensity of corn ethanol. I find many sources from around 2007, but I want something a little more recent (preferably from this decade). This is a ...
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2 votes
1 answer
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Are we running out of fuel?

It's just a matter of time, Peak-Oil will happen. There is no logical argument to assume it will not. We are doing efforts to replace petrol based products with something else, for fuel in combustion ...
jawo's user avatar
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1 answer
213 views

What would be the most sustainable biomass source for (100%) ethanol production?

So I have read that sugar (cane) is way more efficient than corn, (and that Brazil leads the way in taking initiative to actually bother with this advance in biofuels sustainability), and that, based ...
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12 votes
1 answer
2k views

What is the most environmentally-friendly fuel source (e.g. wood, coal, oils, alcohols) for campfire cooking?

When factors like emissions, renewability, and heat / energy efficiency are all taken into account, what would be the very best fuel source(s) to use for camping cooking, with sustainability and ...
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7 votes
2 answers
253 views

What are the risks, sustainability speaking, of halophytes as biofuel?

Halophytes that can be grown in deserts have been researched for biofuel production, among other applications, in aviation. Such biofuels would not compete with food production and not deplete fresh ...
gerrit's user avatar
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