Biofuel
Renewable fuel from biomass, debated for sustainability and land use.
Last updated
Biofuel is a fuel produced over a short time span from biomass, rather than through the slow natural processes that form fossil fuels. It can be made from plants or from agricultural, domestic, or industrial bio waste, and is mostly used for transportation, though it can also be used for heating and electricity. Biofuels are regarded as a renewable energy source, but their use has been subject to criticism regarding the 'food vs fuel' debate, varied sustainability assessments, and concerns about deforestation and biodiversity loss.
Quick Facts
- Field
- Energy, Renewable Fuels
- Known for
- Renewable fuel produced from biomass for transportation
- heating
- and electricity
- Largest bioethanol producer
- United States
- Largest biodiesel producer
- European Union
Facts from the source article.
Lore & Background
Biofuel is produced from biomass such as crops, agricultural residues, or bio waste. The two most common types are bioethanol, made by fermenting sugars or starches, and biodiesel, produced from oils or fats via transesterification. The United States is the largest producer of bioethanol, while the European Union leads in biodiesel production. Brazil produces and uses large amounts of bioethanol in vehicles, including flex-fuel cars available only there.
Reader's Guide
Biofuel is considered a renewable energy source, but its climate change mitigation potential varies widely. Lifecycle assessments show that emissions depend on feedstock, production methods, and land-use changes; in some scenarios, biofuel emissions are comparable to fossil fuels, while in others they result in negative emissions.
The IEA recommends biofuel for applications difficult to electrify, such as shipping and aviation. However, policy has been criticized for favoring ground transportation over aviation. First-generation biofuels (from food crops) raise food-versus-fuel concerns, while advanced biofuels (from waste and non-food feedstocks) aim to avoid that dilemma.
Did You Know?
- Biofuels emit fewer greenhouse gases when burned and are generally considered carbon-neutral, but lifecycle assessments show large emissions from land-use change.
Frequently Asked Questions
What exactly is biofuel?
Biofuel is an energy source produced from organic material (biomass) over a relatively short period, in contrast to fossil fuels that require millions of years of geological processes to form. It is classified as a renewable energy option within the broader fuels sector.
What raw materials can be turned into biofuel?
Biofuel can be derived from dedicated energy crops as well as from agricultural residues, household waste, and industrial byproducts. This wide range of feedstock options is one of its defining traits compared to petroleum-based fuels.
What is biofuel primarily used for?
Transportation is the dominant application, but biofuel also serves heating and electricity-generation needs. It currently occupies a niche within the global renewable-fuels market.
Why is biofuel so controversial?
The most prominent criticism is the 'food versus fuel' tension, where arable land devoted to biofuel crops competes directly with food production. Additional concerns include inconsistent sustainability outcomes, pressure to clear forests, and measurable losses in local biodiversity.
Also in the Codexery
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Sources
Compiled from Wikipedia and the sources listed below. Text from Wikipedia is available under CC BY-SA 4.0; this entry is adapted from it.
- Wikipedia: Biofuel (CC BY-SA 4.0).
- Word definitions: the Codexery glossary, each quoted from its Wikipedia article.
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