Human activities have negative effects on plant and animal species. Some people think it is too late to do anything about this problem. Others believe effective measures can be taken to improve this situation. Discuss both views and give your opinion.

分析：

本題是環保類舊題。關于動植物保護，有些人認為為時已晚，其他則認為可以亡羊補牢。比較正常的觀點當然是后一種。但本題要求討論兩方觀點，因此也要留足夠筆墨來討論動植物保護問題的嚴峻性。

7分范文

Human civilisation has largely destroyed the habitats of many plants and animals so that some species have disappeared entirely from the earth. This situation has caused a strong sense of pessimism among many people that it is already too late for us to do anything about it. Though people have enough reason to hold this pessimistic view, I still have the conviction that we can save the situation by taking effective measures.

In the name of "development" and "civilisation", human beings have long ignored the interest of plants and animals. To build a city, for instance, they will not hesitate to cut all the trees in the area and erect numerous concrete buildings in their place. When the trees are gone, all the animals have to leave or die because they can no longer survive. As the urbanisation process goes on endlessly throughout the world, plants and animals can find less and less space to live in. This situation is bad enough, and shows no positive sign of change.

Yet, this does not mean we are helpless. Though we can not stop the city from spreading altogether, we can create a favorable environment for plants and animals to thrive on. For example, in the center of the city, we can give large spaces for trees and other plants and leave animals living there the way they like. In fact, I have already seen that many cities are running this kind of special "animal parks" which imitate the natural habitats of plants and animals and do not allow people to intrude in. More important is, of course, that people should be educated to understand that human beings themselves would suffer if the entire ecological system were destroyed. Our own existence is so dependent on the plants and animals around us that if they die, we will die, too. With this understanding deep in mind, human beings will try their best to maintain a harmonious relationship with the natural world.

Over 5000 years of human development, we do have had negative effects on plants and animals and the situation seems to be worsening. So, for the benefits of the nature and ourselves, we should act immediately. Though keeping balance between the natural protection and human development is never easy, we can always find a way out. It is never too late to take measures to change the situation, for if we take actions one minute earlier, our chance of survival will increase by one percent.

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