(a) Troposphere: It is lowest layer of atmosphere. It spreads 10 km above sea level which contain oxygen, nitrogen and other gases. The change in climate found in troposphere.
(b) Stratosphere: It is the second layer after troposphere. It spreads from 10 to 50 km above sea level. In stratosphere temperature increases. Entire water vapour and about 80 percent weight of air are found in this layer. Ozone layer is also found in stratosphere. Ozone layer absorbs ultra violet rays of sun. Due to presence of pollutants degradation of ozone layer also found in stratosphere.
(c) Green House Effect: Gases like CO2 and CH4 produced by combustion of fossil fuel, trap heat radiation. Hence the temperature of earth increases. It is known as green house effect. Due to this climate changes and level of sea increases due to increase in temperature glaciers melts which causes flood.
(d) Ozone Hole: The process of decrease in thickness of ozone layer by the reaction of hydrocarbon, freons or gaseous plastic wastes, known as ozone hole formation. Due to ozone hole formation ozone layer can not stop harmful ultra violet rays coming from sun. Hence temperature of earth continuously increases.
