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the ozone layer is a layer on earth, it has large amounts of ozone in it, it protects the earth from the ultraviolet light of the sun

ozone layer depletion is the reduction of the amount of ozone in the stratosphere

ozone depletion ocurs when chlorofluorocarbons and gases are realesed into the atmosphere

today 197 nations have ratified the treaty, wich has prevented large scale ozone layer depletion

we can prevent the ozone layer depletion limiting fossil fuel powered transportation