英语论文网

三百年前，人类与自然的关系更加紧密。地球上的大多数地区还没有受到人类活动的威胁性改变。工业革命尚未开始。还没有发电站，工厂，汽车，或者其他任何分布广泛的污染源。人类毁灭地球环境的这种观念还难以想象。然而现在，人类明显有了毒害陆地、海洋上任何生物的惊人能力。这些大部分是人类在试图提升自身生活质量、减少疼痛与疾病，将媒体引入千家万户，征服土地，生产军事装备过程中，产生的负面影响。但是，有很多问题也都来自于致命性人造化学物质。生产化学物质的同时，也产生了同样的致命性有毒废料，废料被散弃在河流泉水当中，人们丝毫没有意识到这将给环境带来的后果。人们甚至在毁坏自己的饮用水！贫困地区，人们因为水源缺乏而死去，然而就在附近，水源被冲进河流和渗入地下水的肥料、农药污染。1986年，全球农药生产总量为230万吨，并且据报道，生产量还在以年均12%的速度增长着。

杀虫剂、除草剂、肥料曾经是萨利纳斯山谷农民的福音，但最终却被证实对全球水源的毁灭性污染。加利福尼亚州萨利纳斯山谷的人们，数年来使用杀虫剂DBCP，喷洒到葡萄、水果和西红柿上，直到近些年发现，这些农药会导致癌症和不孕。

Three hundred years ago, man lived much closer to nature. For the most part, was not threatened by man-made changes to the global environment in the way is today. The industrial revolution had not begun. There were no power stations, factories, automobiles, or other sources of widespread pollution. The thought of man's ruining the whole earth may have been hard to imagine. Frequently has become obvious that man now has the amazing ability to completely poison everything lives in the land and seas. This mostly happened due to the efforts made to improve their way of life, to reduce pain and disease, bring media communication worldwide to the room of their homes, make the conquest of space and produce military equipment. But, much of the problem is caused by the new deadly chemical compounds made by man .The production of these chemical compounds produced equally lethal and extremely toxic waste which are scattered or thrown into rivers and streams without giving attention to the consequences that this will bring to human and the environment. Man is ruining even his drinking water! In poor lands, millions of people die each year because the shortages water, instead nearby, water sources are contaminated by, among other things, fertilizers and pesticides that wash into rivers and seep into groundwater. In 1986 the world production of pesticides was 2.3 million tons, and the rate of increase is reported to be 12 percent per year. (EPA)

Pesticides, herbicides, and fertilizers have been a blessing for farmers throughout the Salinas Valley, but proved to be disastrous for the waters of the Earth. For years the Salinas Valley located in California State, farmers sprayed with pesticide DBCP grapes, fruit and tomatoes, only to discover in recent years that this can cause cancer and infertility in humans. Although this product is no longer used, venom has continued filter through the layers of soil to groundwater. A Health Department spokesman said: 'the 35% of wells in the Valley have DBCP'. In a county of the same State, Over 1 million children consume more than the safe adult dose of organophosphates (insecticides that work by poisoning the nervous system) daily, reports Newsweek magazine. There are other pesticides that affect the nervous system, and even from other suspected to cause diseases. It was discovered that some herbicides cause damage to the brain, crippling the victim. In many agricultural areas fertilizers have resulted in the nitrate concentration exceeds the maxim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。