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职称英语理工完形填空历年试题模拟试题补全短文概括大意词汇指导阅读理解例题习题卫生职称英语词汇指导完形填空概括大意历年试题阅读理解补全短文模拟试题例题习题综合职称英语完形填空历年试题模拟试题例题习题词汇指导阅读理解补全短文概括大意
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:13756
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。
Many fieldworkers as Jose have never received any type of training or information regarding pesticides and other harmful chemicals used in the fields in their work place. Usually they are unfamiliar with many of the symptoms of pesticide poisoning. Also fieldworkers feel weighed down by being in this country, unsure of whom to ask for help due to their language barrier whit out knowing what to ask the doctors and other service providers. The worse scenarios, many of them are undocumented workers from Mexico and Latin America, fearfully for job loss or drastically, deportation to their country if they complain to any possible work-related or pesticide injury. Consequently this workforce struggling daily raise crops that feed the nation have to silence their pesticide exposure-related problems.
Thus there are factors that farmers are considered using Mevinphos, such as the population of insects, high taxes, and the regulations imposed by the use of this pesticide. Farmers known that the insect population affect the marketability of lettuce leaf, consequently would bring them great lost, therefore carefully evaluate the gains levels at the end of the harvest by balancing all expenses incurred to the use or not use of Mevinphos. Finally, farmers compare the results of the evaluation, balancing the benefits expected with or without the use of this pesticide. Although all these factors play an important role in the decision to apply Mevinphos, farmers in result opt for the use of this product because at the end, result in gains in high proportion to their pockets. (Sunding and Zivin, 2000).
In the United States, pesticide bans are the main form of regulation of pesticides used. However, pesticide bans success depends on the availability the use of substitutes to pesticides. No substitutes, prohibits the result in lower levels of production, higher prices and a loss of income for farmers. However, other methods, such as the partial ban (restrictive political use and pesticide taxes) can result in benefits for health without so many economic costs (Zilberman,) There is another factor that affects positively, as well negatively is the PHI (pre-harvest intervals).
Government authorities in an effort to reduce the number of field worker diseases caused by contact with pesticides impose period time application pesticides and tax regulation to the farmers for pesticides used. Consequently impose increase PHI, the cultivation of intervals which is designed to reduce agricultural workers exposure to harmful chemicals and allow the disintegration of the pesticide that agricultural workers come into contact with. However, these measures are not always positive, also can bring results negative to alter the amount of pesticide needed, as a result farmers can increase the ove本论文由英语论文网提供整理,提供论文代写,英语论文代写,代写论文,代写英语论文,代写留学生论文,代写英文论文,留学生论文代写相关核心关键词搜索。