CFC are not found naturally they are synthetic in nature. When CFC's escape into the atmosphere, they rise up and reach the ozone layer. Here, the CFC's breakdown the ozone. Scientists believe that the damage to the ozone layer will have two effects on the earth's surface: Firstly the extra radiation will cause the lower atmosphere to warm up and this will add to the green house effect. Second, the increase in UV radiation would har many of the earth's organisms including humans.
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