The highest consumption rate in today’s world is of fuel. They are a man’s— best friend. fuels are created by the decomposition of dead plant and animal life that existed in the Earth millions of years ago. From the day it has been extracted and discovered, they have served the mankind and are still one of the most useful tools for human existence. The fuels include petroleum, coal and natural gas. In fact, the whole world is dependent on fuels to fulfill their daily energy needs. Though adoption of renewable energy sources has increased sharply in last decade, still it will take some more years to reduce our dependance on fuels drastically.