As the world is increasingly densely-populated, air pollution has now intensified as a severe menace. The plague proceeds from four fields of human activities: industry, energy industry, transportation industry and agriculture.As factories, trains, planes and buses all necessitate energies as their power resources, which are mostly supplied by burning, the pollution is ,in some extent, inevitable. Considering this, scientists are now working on the research of new power supplies that are more friendly to environment. ——最後一句没看懂。
As the world population is becoming more and more densely populated (densely populated),air pollution has become a serious problem. Air pollution comes mainly from four main areas of human activities: industry, energy industry, transportation industry, and agriculture. Operations of factories providing power for trains, airplanes and buses all require energy. Almost all of this energy is produced through burning fuel and this will result in air pollution. Scientists are researching new methods of electric power generation that can reduce environmental damage. Enhanced public environmental awareness causes activities such as recycling (recycling) and other activities to come into being.如果答案对亲有所帮助请采纳予以鼓励!如果有疑问欢迎追问...
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