Saving the Earth
The population of the earth is increasing very fast. Humans must make the earth support the increasing population. This has made it necessary for agriculture and industry to develop rapidly. Such a rapid development produces more and more waste, which goes into the water, the soil and the air. Some of it is made harmless. However, where there is too much of it, the poisonous waste may do great harm to the things around the people.
When farmers add fertilizer to the soil to make plants grow better, or use poison to kill pests, poison is sent into the air, the water and the soil. When birds, fish and people eat the grain, drink the water or breath the air, harm will be done to their health.
The air in big cities is often made very dirty by cars and factories. Millions of tons of waste and poisonous gases are sent into the air with the smoke. In some places, little is done to make the smoke clean before it goes into the air.
Fortunately, people are beginning to realize just how serious the whole situation is. In many countries, laws have been made to stop factories from sending out poisonous gases.
[點評]
人類人口過快的成長，社會過快的發展使地球不堪重負。所幸，人們已意識到這一點，開始行動起來拯救地球，也就是拯救自己。此文證據雖然充分，結尾卻有些分量不足。
[參考譯文]
拯救地球
地球的人口成長很快。人類要使地球能夠養活眾多的人口，就得迅速發展工農業。由于工農業的迅速發展，即能產生出越來越多的廢棄物，這些廢棄物流進水裏，滲入到土壤中，散發進空氣中。其中的有些是無害的。然而，在廢棄物太多的地方，有毒的東西會對周圍的物和人有害。
農民為了讓庄稼地茂盛，給地裏施肥，為了殺死害蟲，往地裏噴葯，這個時候，有毒的氣體就會散發到空氣中，水裏和上壤裏。當鳥、魚以及人們吃這些糧食，飲用這些水，呼吸空氣時，就對他們的健康造成危害。
大城市的空氣經常被汽車和工廠弄得很糟。成千上萬噸的廢物和有毒氣體隨煙散發到空氣中，有些地方，根本就不做凈化處理，直接讓它排到空氣中。
可慶幸的是，人們已漸漸對此嚴重的情勢有所認識。有些國家還頒布了法令來阻止工廠向外排放毒氣。