imagine , if the oil supply gets exhausted one day how would this effect our life style ?

Exhaustion of oil sources would affect life in the following ways:

i) It would lead to a crisis of supply of energy.

ii) Power sources that require oil would be adversely affected.

iii) Most of the world transport is dependent on fossil fuel. It would also be crippled.

iv) There would be conflicts between countries and communities for control of alternative sources of energy.

v) World trade and economy would be negatively affected as supply of goods will break down causing scarcity.