What is Green house effect ? How does it affect the global climate ?

Explanation

Atmosphere around the earth acts like a glass of the green house chamber. The gases present in the atmosphere which cause green house effect are referred to as green house gases. The various green house gases are :
`CO_(2), H_(2)O` vapour, chlorofluoro carbons and oxides of nitrogen.
The green house gases in the atmosphere form a thick cover around the earth. The earth receives a large amount of energy from the sun. The IR radiations coming from sun are not absorbed by atmospheric gases. The earth absorbs these IR radiations of short wavelength.
As a results of this the temperature of earth stands rising. Eventually , earth starts emitting infrared radiations of longer wavelengths. Th partially radiated infra red radiations from the earth are absorbed by `CO_(2)`. This results in excessive heating of earths atmosphere.