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英语论文-环境污染问题研究 [2]

论文作者:www.51lunwen.org论文属性:职称论文 Scholarship Papers登出时间:2015-04-29编辑:Cinderella点击率:13753

论文字数:3306论文编号:org201502031324545485语种:英语 English地区:中国价格:免费论文

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摘要:本文以美国萨利纳斯州为例,解析了农药、杀虫剂、肥料等对土壤和水源的污染,进而探讨了全球环境污染的严重问题。

um number allowed by the law of the State of California.(EHIB) These chemicals have also come to aquifers.

 

With progress in the field of chemistry has improved the quality of detergents and solvents, liquids for the dry cleaning and products for the cleaning of septic, to only name a few. Results have greatly benefited humanity. However, as such products are filtered out of the ground bring pollution of pure waters of the Earth for future generations as a result. Raymond Myers Environmental Science Professor of Heald College said: 'we're poisoning ourselves and our property'.

 

It was believed that the land itself purify these chemicals as passed through its layers, making them harmless. However, the last decade has discovered that many of these dangerous substances have not been filtered, but have followed by penetrating to the aquifers and contaminated them for future generations. 'Pollution of groundwater is result of committed sins long ago' said Mr. Myers. 'No one had the insight to predict it.'

 

However, the sins continue committing so far. Quality Environmental Protection Agency (EPA) estimates that only in the United States more than 1.5 billion gallons of hazardous wastes annually through groundwater. Much of these wastes are discarded by men without scruples and greedy who don't mind the terrible damage this causes the water supply and human health. A scientist said: Only 1 quart of solvent can contaminate over 20,000,000 of groundwater to a level exceeding the pollution ceiling established by the majority of States (EHIB). When one thinks in terms of billion liters or gallons of waste, then the expression of water, water everywhere and not a drop to take, highlights as something horrible that can become a reality. What is the case of the pesticide use in the agriculture industry?

 

There are chemicals with long names that few people can pronounce and that for convenience bear letters such as PCB (Polychlorinated Biphenyls), DDT (dichlorodiphenyltrichloroethane), PCDD (Polychlorinated dibenzodioxins), PCDF (Polychlorinated dibenzofurans), TCDD (Tetrachlorodibenzodioxin). This alphabet soup of toxic chemicals is a deadly hazard both to humans and to earth's resources on which man must rely to live. “Thousands upon thousands of releases of toxic substances into the environment” occur each year, said a spokesman for the United State Environmental Protection Agency. Such releases pose a threat to the quality of air, surface water, and underground drinking supplies, and poison the soil for decades to come. The United Stated Environmental Protection Agency estimates that in the United States alone, 1.5 trillion gallons of hazardous chemical wastes find their way into the underground water systems each year. Knowing that just one gallon of solvent will contaminate 20 million gallons of groundwater to exceed safe levels, it is staggering to compute what catastrophic damage 1.5 trillion gallons of poisonous chemicals are doing (EHIB).

 

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