Why is aerosol hairspray bad for the environment?

the aerosol spray contains CFC (clorofluorocarbon). when it goes to the air. it will form some kind of carbon layer at the atmosphere. the ultraviolet from the sun enters the earth through the atmosphere and couldn't get out because of carbon layer block the ray. the mother earth is getting warmer day by day as many products release their own carbon.it phenomena is called global warming or green house effect