Bio fuels are the types of fuels that are produced from decayed biological matter, such as plants. Such type of fuel can exist in solid, liquid, as well as gas states. Bio fuels are different from fossil fuels and they differ in following points:

Fossil fuels take a million years to build, while the process of producing bio-fuels is quite faster, say it can be produced in a few days.

Fossil fuels cause pollution, bio-fuels are comparatively safer.

Fossil fuels are non-renewable sources of energy, while bio-fuels are renewable sources of energy.

Bio-fuels can be categorised into four different types. They are- first generation, second generation, third generation, and fourth generation. The first type of bio-fuels are derived from vegetable fats, starch, and sugar, that are in turn derived from food-crops, as well as from animal fats. Examples of first generation bio-fuel include diogas, bio-diesel and vegetable oil.

The second generation of bio-fuels are derived from waste biomass. Various kinds of alcohols and diesel generated from wood are some of the examples of this type of fuels. These are considered more balanced option than the first-generation bio-fuels.

The third generation bio-fuels are derived from algae. Algae are farmed on large scales in order to create this type of bio-fuels. The algae fuels are highly environment-friendly, since they easily decompose into the soil without harming it.

The fourth generation bio-fuels are derived micro-organisms, that are raised to work with carbon dioxide to generate fuel.

Here are a few advantages of bio-fuels:

• Bio-fuels basically reduces the use of fossil fuels, that non-renewable sources.
• These are eco-friendly
• They also help reduce carbon emission into the atmosphere.
• Bio-fuels are also cheaper or cost-effective for consumers.