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Biofuel is fuel from recently lifeless or living biological material. It is different to fossil fuels from long dead biological material. Biofuel can be in forms of solid, liquid or gas.

Biofuels are usually used to power cars, heat homes and for cooking. Biofuel companies are mainly from Europe, Asia and the Americas. Recent technologies developed at the Los Alamos National Lab even allows pollution to be converted into renewable biofuel. Argofuels are biofuels that are produced from specific crops, rather than from waste processes such as landfill or recycled vegetable oil.

There are two common ways of producing the liquid and gas version of argofuels. One is to grow crops that are high in sugar (e.g. Sugar cane) or starch (e.g. corn), and then use yeast to produce ethyl alcohol (ethanol). The second is to grow plants that contain high amounts of vegetable oil, such as oil palm, soybean and algae. When these oils are heated, their viscosity is reduced, and they can be burned directly in a diesel engine, or they can be chemically processed to produce fuels such as biodiesel. Wood and its by-products can also be converted into biofuels such as charcoal, woodgas, methanol or ethanol fuel. It is also possible to make cellulosic ethanol from non-edible plant parts, but this can be difficult to accomplish economically.

Solid biomass is also used. Firewood has been used for thousands of years. Many materials such as wood and grasses can be dried and pelletised and burnt, and this can be used to produce power.