The protective layer of the Earth, the ozone layer, which protects the Earth from the sun’s destructive UV (ultraviolet) rays, is being damaged by CFCs (chlorofluorocarbons). They are released by the daily use of industrial and household products: refrigerators, air conditioners, foam insulation, cleaning chemicals, food packaging. Jn the ozone layer they attack the ozone molecules making a «hole». This «hole» allows more UV rays to penetrate to the Earth. It increases the risk of skin cancer , weakens the immune system of people. Besides, UV rays influence the oceans, the growth of plankton, an essential part of the marine-life food chain in the negative way, reduce economically important crops (rice, cotton, soy beans). The life cycle is going to be undermined by the ozone.
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Различие и особенности употребления между Need not и Must not в английском языке.