once man did not have to think about the protection of his environment. there were few people on the earth, and natural resources seemed to be unlimited.
today things are different. the world has become too crowded. we are using up our natural resources,and polluting our environment with dangerous chemicals. if we continue to do this, human life on earth will not survive.
we realize that if too many fish are taken from the sea, there will soon be none left. yet,with modern fishing methods, more and more fish are caught.we know that if too many trees are cut down, forests will disappear. yet, we continue to use powerful machines to cut down more and more trees. we see that if rivers are polluted with waste products, we will die. yet, waste products are
still put into rivers.
we know that if the population continues to rise at the present rate, in a few years, there won't be enough food.what can we do to solve these problems?
if we eat more vegetables and less meat, there will be more food available. land for crops feeds five times more people than land where animals are kept.
our natural resources will last longer if we learn to recycie them.
the world population will not rise so quickly if people use modern methods of birth control.
finally, if we educate people to think about the problems we shall have a better and cleaner planet in the future.
保護環境
過去，人們不必擔心保護環境的問題。 因為那時地球上人口稀少，自然資源似乎取之不盡。
如今，一切都改變了。世界變得擁擠異常。我們正在耗盡我們的自然資源，有毒化學制品的使用也正污染著環境。如果我們繼續這樣下去，地球上的生命將不復存在。
我們都知道如果從海里捕捉太多的魚，海里就不會再有魚了。但是，現代化的捕魚技術使得捕魚量越來越大。我們都知道如果砍伐太多的樹木，森林就會消失。但是，我
們仍舊使用強大的機械砍伐越來越多的樹木。我們都知道如果河水被廢棄物污染的話，我們只有死路一條。但是廢棄物仍然源源不斷地進入河里
我們知道，人口繼續照現在這個速度增長的話，不出幾年，就會發生食物短缺。我們該如何解決這些問題呢?
如果我們多吃蔬菜，少吃肉類的話，我們就會有更多的食物。因為同樣大小的土地如果種莊稼的話會比養殖動物多養活五倍多的人。
如果我們學會再利用的話，自然資源就能持續更久。
如果人們使用現代化的生育控制方法，世界人口就不會增長如此迅猛。
最后，如果我們能夠教育人們都意識到這些問題的話，未來我們就會有一個更好、更潔凈的星球。
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