4. Air Pollution
Air pollution is one of the major problems of the modern world. A great deal of energy is needed to run the factories of modern industrial nations. Automobile, trains, planes and busses need energy, too. Nearly all of this energy is produced by burning fuels. The burning produces wastes, some of which remain in the air, causing air pollution.
Scientists are finding ways to stop air pollution especially in big industrial areas and densely-populated cities. They are studying new ways of generating electricity that may be less damaging to the environment. In the meantime, many power plants are being modernized to give off less polluted material. Also, engineers try to design and locate new power plants to do minimum damage to the environment.
However, it may be that we still have a long way to go before we have a clean world. Nearly all of the countries are trying hard to prevent and control air pollution. There indeed seems to be no end to tasks that environmentalists will be required to do. People will continually find new ways to control pollution.
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描写我的家乡 My Hometown
做一个乐观的人To Be an Optimistic Person
给爸爸妈妈的信 A Letter to My Parents
如何保持健康 How to Keep Healthy
兴趣是最好的老师Interest Is the Best Teacher
旅行计划 Plan for Two Days in Beijing
一封关于如何学好中文的信 A letter on how to learn Chinese
鲁迅 Brief Introduction of Lu Xun
京剧的由来 The History of Peking Opera
英语的重要性 The Importance of English
礼貌用语的魔力Magic Power of Polite Words
关于高中生学习压力Learning stress of senior high school student
公园该不该收门票?Should park admission?
远离香烟 Give up Smoking
学会学习 Learn to Learn
关于出国留学的调查A Survey on Study Abroad
发改委再次上调成品油价,价格,上涨China raises fuel prices
幸运号码真的能带来好运吗?Do Lucky Numbers Really Bring Good Luck?
便条 Note