英语介绍臭氧 臭氧的利弊ppt课件.ppt

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1、Ozone Hole,成员：许睿萍朱晶华张秀梅,What are O3 and the ozone layer ?,O3 is composed of three oxygen atoms,the ozone layer.,The function of the ozone layer,O3 could absorb ultraviolet (紫外线) in the sunlight, and protect the ground living organisms from ultraviolet damage,Ozone：,Ozone is oxygen allotropes(同素异形体).

2、 In room temperature, it is a kind of special odor blue gas. Ozone mainly exists 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 us

3、ed in food purification, drinking water purification, disinfection sterilization(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】 decl

4、ines at a speed of 2.7% every ten years,What will happen if there is no ozone in the 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 agricul

5、tural products will decrease.,(2） fishery production decreases,（3）destroy forests,The Antarctic ozone hole,Changes 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 appliancesfoam plasticschemicalsautomotivefire fightin

6、g equipment,CFC- killer of the ozone layer,Defensive measures,In1985, the first international convention (保护臭氧层维也纳公约)for protecting ozone had 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

7、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 substitutions【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【

8、 氯氟烃Chlorofluorocarbons】.,A.tackle with waste refrigerators and electricalB. Purchase those products with the logo of no-CFCsC. The government should make policiesD. Tell the surrounding people of the importance to protect the ozone layer,My Advices for dealing with CFCs,国际保护臭氧层日,Thank U for watching!,