I study about Ozone Layer a little.
Ozone Layer is made of three oxygen atoms、it is protect us from bad ultraviolet by absorbing .
If ,when we have a lot of exposure to ultraviolet light,may damage DNA ,cause cancer.
Ozone Layer protect us from these dangerous,but Ozone Layer have been destroying by Freon. already ｔhere are very big Ozone hole
So "Vienna Convention for the Protection of the Ozone Layer" and"Montreal Protocol on Substances that Deplete the Ozone Layer"are adopted,but I worry about Ozone Layer and earth.
