The fossil fuels has the following disadvantages:

(i) Fossil fuels are non-renewable sources of energy and once used they cannot be renewed again so early. Fossils take millions of years to be renewed.

(ii) The burning of fossil fuels causes a lot of air pollution. They release toxic gases such as Sulphur-dioxide ( ), carbon dioxide and nitrogen oxides which cause acid rain. The acid rain damages plant life as well as aquatic life on earth. causes greenhouse effect leading to excessive heating of the earth.

(iii) The burning of coal produces smoke which pollutes the air.