Bio-fuels are fuels that are formed when biological matter that decomposes. The bio-fuels are mostly derived from plants. Bio-fuels exist in three states of matter: solid, liquid, and gas.

Difference of bio-fuels and fossil fuels
Fossil fuels take a million years to build .
Bio-fuels can be made extremely fast.
Fossil fuels generate huge amounts of pollution.
Bio-fuels are comparatively safer.
Unlike fossil fuels, bio-fuels are renewable sources of energy.

Advantages of bio-fuels

Bio-fuels lessen the burden on gradually-vanishing fossil fuels.
Bio-fuels are environment-friendly. They help protect the environment.
Bio-fuels are very cost-effective for consumers.

Disadvantages of bio-fuels
Though beneficial for the environment, economists have long debated on the usefulness of first generation bio-fuels when compared to the lack of food they cause. Generating fuel from food crops makes food crops unworthy of human consumption. Some people believe that being a higher priority than fuel, food should not be farmed for making fuels but for human consumption.

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