The upper stratosphere consist of considerable amount of ozone which work as an effective screen for the harmful uv radiation reaching to the earth surface. The CFC and Halons migrate into the upper atmosphere and slowly diffuse into the stratosphere. This is a slow process and may take 5-15 years.
In the stratosphere, unfiltered uv radiation severs the chemical bonds releasing chlorine rom the rest of the CFC. This attack the ozone molecule resulting into splitting it into an oxygen molecule and an oxygen atom. This way the ozone layer is being damaged.
This change in ozone layer causes the harmful uv radiation reach into the earth surface which has serious implications for mankind.
-This uv radiation affect the human health like sunburn, aging of the skin, chicken pox etc.
-It also affect the ability of the plants to capture light energy during the process of photosynthesis.
-This reduce the nutrient content and growth of the plant.
-It also affect the phytoplankton and zooplankton thereby adversely affect marine ecosystem.
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