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.
一旦人不必考虑保护环境。地球上几乎没有人，自然资源似乎是无限的。 今天的事情是不同的。这个世界变得太拥挤。我们正在利用我们的自然资源，污染我们的环境与危险的化学品。如果我们继续这样做，地球上人类的生命将无法生存。 我们意识到，如果有太多的鱼都从海里被夺走，很快就没有了。然而，随着现代捕鱼方式，越来越多的鱼被捕获，我们知道如果砍伐太多的树木，森林就会消失。然而，我们继续使用强大的机器来减少越来越多的树。我们看到，如果河流被污染的产品，我们会死。然而，废弃的产品是 还投入河流。 我们知道如果人口继续以现在的速度增长，在几年内，就不会有足够的粮食，我们能做什么来解决这些问题？ 如果我们多吃蔬菜，少吃肉，就会有更多的食物供应。作物用地饲料五倍以上的人比动物的土地。 我们的自然资源将持续更长的时间，如果我们学会利用它们。 如果人们使用现代化的生育控制方法，世界人口将不会快速增长。 最后，如果我们教育人们思考问题，我们将有一个更好的和更清洁的地球在未来。
