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.
空氣汙染
空氣汙染是當今世界的主要問題之一。管理現代工業國家的工廠需要大量的能源。汽車、火車、飛機和公共汽車也需要能源。幾乎所有這些能量都是燃燒燃料產生的。燃燒產生廢物，其中一些留在空氣中，造成空氣汙染。
科學家們正在尋找阻止空氣汙染的方法，特別是在大型工業區和人口密集的城市。他們正在研究可能對環境危害較小的發電新方法。與此同時，許多發電廠正在進行現代化改造，以減少汙染。此外，工程師們還試圖設計和定位新的發電廠，以儘量減少對環境的破壞。
然而，也許我們還有很長的路要走，才能有一個「乾淨」的世界。幾乎所有的國家都在努力防止和控制空氣汙染。事實上，環保人士將被要求完成的任務似乎沒有盡頭。人們會不斷地找到控制汙染的新方法。