英语作文:Hotter or Colder ?

英语作文:Hotter or Colder ?

　　在平日的学习、工作和生活里，大家一定都接触过作文吧，作文一定要做到主题集中，围绕同一主题作深入阐述，切忌东拉西扯，主题涣散甚至无主题。那么一般作文是怎么写的呢？下面是小编收集整理的英语作文:Hotter or Colder ?，欢迎大家借鉴与参考，希望对大家有所帮助。

　　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 worlds average temperature.

　　If this view is correct and the worlds 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 earths 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 worlds temperature will stay about the same as it is now.

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