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1、成员：许睿萍朱晶华张秀梅O3 is composed of three oxygen atomsthe ozone layer.O3 could absorb ultraviolet (紫外线) in the sunlight, and protect the ground living organisms from ultraviolet damageOzone： Ozone is oxygen allotropes(同素异形体). In room temperature, it is a kind of special odor blue gas. Ozone mainly exists
2、in the earths surface from 20 kilometers of stratospheric(同温层的) ozone layer in the lower part. It absorbs short-waved ultraviolet rays(紫外线) which are harmful to human body, preventing their reaching the earth. Widely used in food purification, drinking water purification, disinfection sterilization(
3、消毒杀菌), air purification, bath, beauty, health care. Ozone hole: 1）Current situation：（1）90% of Antarctic【南极的】 ozone has been destroyed （2）Ozone-layer above the Arctic【北极】 has reduced 20% （3）ozone over the Tibet【西藏】 declines at a speed of 2.7% every ten years What will happen if there is no ozone in t
4、he atmosphere ?3) Influence to people:(1) Risk of an increase in skin cancers (2) cause cataract ktrkt 白内障 (3) Make the immune system becomes weaker to the ecological system:(1) the production and quality of agricultural products will decrease.(2） fishery production decreases（3）destroy forestsChange
5、s of Antarctic ozone hole from 1945 to 1995 CFC used as refrigerant(制冷剂) blowing agent(发泡剂) clean agent(清洗剂) Widely used in household appliances foam plastics chemicals automotive fire fighting equipmentDefensive measures In1985, the first international convention (保护臭氧层维也纳公约)for protecting ozone ha
6、d been passed through （1）more than 100 countries have collaborated【合作、协作、沟通】 through international affairs:In 1987, another international convention (关于消耗臭氧层物质的蒙特利尔议定书)had been passed through.In 1995 , establish International Ozone Layer Protection Day【国际保护臭氧层日】 as September 16th. (2)create substitu
7、tions【代替、替代物】 to instead of the ozone-depleting substance(耗蚀臭氧层物质) (3)as for common people :not use or less use something ozone-depleting substance like CFCs【 氯氟烃Chlorofluorocarbons】. A.tackle with waste refrigerators and electrical B. Purchase those products with the logo of no-CFCs C. The government should make policies D. Tell the surrounding people of the importance to protect the ozone layerMy Advices for dealing with CFCs