What are the disadvantages of fossil fuels ?

solution:
Fossil fuels (coal, petroleum and natural gas) have the following disadvantages :

(1) The fossil fuels are non-renewable sources of energy, if we continue to consume these sources at alarming rates, we would soon run out of energy.

(2) There are no such alternate sources of energy developed till today which can replace fossil fuels. Thus, large dependency on fossil fuels for most of our energy requirements may create problem in future.

(3) Air pollution is caused by burning fossil fuels.

(4) Carbon-dioxide produced by burning these fuels contributes to greenhouse effect.