As the term suggests, bio-fuels are fuels that are made when biological matter rots. The bio-fuels are mostly derived from plants. Bio-fuels exist in all the 3 states of matter: solid, liquid, and gas.

Difference between bio-fuels and fossil fuels
Bio-fuels are dissimilar from carbon-based fuels in the following ways:
- Fossil fuels take a million years to build whereas bio-fuels can be made highly fast, in a matter of days.
- carbon-based fuels generate big amounts of pollution. Bio-fuels are relatively safer.
- Bio-fuels are renewable sources of energy unlike fossil fuels.

Different types of bio-fuels
Bio-fuels have been specified into four types : first generation, 2nd generation, 3rd generation, and 4th generation.

The first generation bio-fuels are derived from plant fats, starch, and sugar, which are in turn derived from food-crops. The 1st generation fuels are also derived from animal fats. Biogas, bio-diesel, and plant oil are some examples of this kind of bio-fuels.

The 2nd generation of bio-fuels is principally derived from waste biomass, so making it a more balanced option compared to the first-generation bio-fuels. Different kinds of alcohols and diesel generated from wood fall into the class of 2nd generation bio-fuels.

The 3rd generation comprises of bio-fuels derived from algae. Algae are farmed on large scales for making these bio-fuels. The algae fuels are highly environment-friendly as they can simply rot into the soil without hurting it.

The bio-fuels in the 4th generation are derived by a method in which micro-organisms are raised to work with CO2 to generate fuel.

Advantages of bio-fuels
Bio-fuels prove advantageous in the following ways:
- Bio-fuels lessen the duty on gradually-vanishing fossil fuels.
- Bio-fuels are environment-friendly. They help reduce carbon emissions into the atmosphere.
- Bio-fuels, especially, bio-diesel prove to be very cost-effective for consumers.

Disadvantages of bio-fuels
Bio-fuels are not bereft of feedback. Though profitable for the environment, bio-fuels have its downsides, paradoxically in the environmental purview. Bio-fuels have received criticism for many reasons, a pair which are stated below:
- Financial consultants have long discussed on the usefulness of first generation bio-fuels when put next to the absence of food they cause. Generating fuel from food crops makes food crops unworthy of human consumption. Some folk believe that being a higher concern than fuel, food should not be farmed for making fuels but for human consumption.
- Making bio-fuels need acres of farming land, so encroaching upon the natural habitat of plants and animals.

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