NEED FOR CONSERVATION OF OZONE LAYER

The ozone layer is a layer in Earth's atmosphere that absorbs most of the Sun's UV radiation. It contains relatively high concentrations of ozone (O₃), although it is still very small with regard to ordinary oxygen, and is less than ten parts per million, the average ozone concentration in Earth's atmosphere being only about 0.6 parts per million. The ozone layer is mainly found in the lower portion of the stratosphere from approximately 20 to 30 kilometres  above Earth, though the thickness varies seasonally and geographically

The ozone layer absorbs 97–99% of the Sun's medium-frequency ultraviolet light (from about 200 nm to 315 nm wavelength), which otherwise would potentially damage exposed life forms on Earth.

Depletion of ozone layer will definitely make life on earth difficult because of direct rays reaching the surface and people directly affected with the harmful rays.

Day by day depletion will lead to extinction of life on earth as people only need a certain amount of sunlight to survive. 
 Human interference in the nature has lead to a direct evidence of a total destruction by nature on this living planet.Hence, human beings are themselves contributing      to this unexpected necessities returned by the nature as an adverse gift of human interference in the environment. The below video shows how ozone is really affected by human interference.