The ozone layer acts as a layer which is the top most protective layer in the atmosphere of earth. It protects earth from UV rays i.e. ultra violent radiations, which comes directly from the sun. If this layer disappears, then all the living organisms will face numerous changes in there atmosphere, health, lifestyle. People will suffer from skin cancer, deadly skin burn, extreme heat. As the ultra violent rays will directly attack on the earth as there is no optical for it in its way. it will increase earth temperature, which will cause climate changes, melting of glaciers, floods, extincting of some animal species, humans will become sick and start dieing as in the glacier there are so many unknown viruses and bacteria's trapped. They will be into the atmosphere because of UV rays.
So its important to protect ozone layer depletion.