英语翻译There was one thought that air pollution affected only t

英语翻译
There was one thought that air pollution affected only the area immediately around large cities with factories and heavy automobile traffic.At present,we realize that although these are the areas with the worst air pollution,the problem is literally worldwide.On several occasions over the past decade,a heavy cloud of air pollution has covered the east of the United States and brought health warnings in rural areas away from any major concentration of manufacturing and automobile traffic.In fact,the very climate of the entire earth may be infected by air pollution.Some scientists consider that the increasing concentration of carbon dioxide in the air resulting from the burning of fossil fuels (coal and oil) is creating a “greenhouse effect”— conserving heat reflected from the earth and raising the world’s average temperature.If this view is correct and the world’s temperature is raised only a few degrees,much of the polar ice cap will melt and cities such as New York,Boston,Miami,and New Orleans will be in water.
Another view,less widely held,is that increasing particular matter in the atmosphere is blocking sunlight and lowering the earth’s temperature — a result that would be equally disastrous.A drop of just a few degrees could create something close to a new ice age,and would bring difficulties in many of our top farming areas.Today we do not know for sure that either of these conditions will happen (though one recent government report drafted by experts in the field concluded that the greenhouse effect is very possible) Perhaps,if we are lucky enough,the two tendencies will offset each other and the world’s temperature will stay about the same as it is now.Driven by economic profits,people neglect the damage on our environment caused by the “advanced civilization”.Maybe the air pollution is the price the human beings have to pay for their development.But is it really worthwhile?

有一个思想,空气污染影响只有立即周围工厂和汽车交通拥挤的大城市的区域. 目前情况下,我们认识到这些虽然空气污染最严重地区问题是字面上的全球范围内. 在过去十年的几次,阴云的空气污染已覆盖的美国东部和带来健康忠告远离任何主要的浓度,制造和汽车交通的农村地区. 事实上,整个地球的气候很可能被感染的空气污染. 一些科学家认为增加燃烧矿物燃料 （煤和油） 而引致的空气中二氧化碳的浓度创建一个"温室效应"— 节约从地球反射的热量和提高世界的平均温度. 如果此视图是否正确,以及世界上温度升高仅几度,多极地冰帽的融化将和纽约、 波士顿、 迈阿密和新奥尔良等城市将在水中. 较广泛举行的另一种看法是增加大气中的特定物质是阻止阳光,和地球降温 — 会同样灾难性的结果. 一滴几度会使靠近一个新的冰河时代的东西,并会带来很多地区的农民我们顶部的困难. 今天我们并不知道肯定其中一个条件会发生 （虽然最近一份政府报告,由领域专家起草的结论温室效应是很有可能） 也许,如果我们是幸运的两种趋势会抵消彼此,因为它现在是世界上温度保持大致相同. 人带动经济效益,忽视对我们致了先进文明的环境损害. 也许空气污染是人类要发展付出的代价. 但是它真的值得吗?