2022年6月大学英语四级作文范文：空气污染

2022-03-28 10:52:00来源：网络

　　新东方在线英语四级频道为四级考生整理了2022年6月大学英语四级作文范文：空气污染，希望考生们学会根据题目先自己练习之后根据范文仿写，学会其中的句式，让英语四级作文分数更上一层楼。

　　2022年6月英语四级作文范文100篇汇总

　　Hotter or Colder ?

　　It was once thought that air pollution affected only the area immediately around large cities with factories and/or heavy automobile traffic.Today, we know 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 entire eastern half of the United States and led to health warnings even in rural areas away from any major concentration of manufacturing and automobile traffic.

　　In fact, the climate of the entire earth may be affected by air pollution.Some scientists feel 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” —holding in 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 under water.Another view, less widely held,is that increasing particulate 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 new ice age and would make agriculture difficult or impossible in many of our top farming areas.

　　At present we do not know for sure that either of these conditions will happen (though one recent government report prepared by experts in the field concluded that the greenhouse effect is very likely).Perhaps, if we are very lucky,the two tendencies will offset each other and the world’s temperature will stay about the same as it is now.

　　2022年6月英语四级作文范文100篇汇总

　　以上就是新东方在线英语四级频道给大家整理的“2022年6月大学英语四级作文范文：空气污染”相关内容，希望对大家有所帮助，更多备考内容，欢迎随时关注新东方在线英语四级频道。

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