issue121，第一篇作文，没限时，请大家狠拍。。。

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In contemporary society, people begin to realize the importance of retaining the biologic diversity in the earth so that lots of money and human resources are spent to save endangered species. Yet the speaker holds an original point of view that there is no justification to make extraordinary efforts in the protection work since many species have become extinct at various times in the geological past as a result of natural rather than human processes. In my opinion, this assertion is not cogent and reasonable enough to persuade the mass.
Admittedly, many species have disappeared in consequence of climate or terrain changes or disasters. A widely spread explanation of the extinction of dinosaurs is that an asteroid crashed on the surface of the earth in the pristine period when dinosaurs ruled the whole world, and thus triggered thick clouds consisted of sands that shadowed the earth for years. Lacking of sunshine, the temperature decreased rapidly so that lots of plants and animals, including many prehistoric mammals, were extirpated.
The proponents of the topic may stick to such examples to support their point. But unfortunately it is human beings that accelerate the extinction process of many species. A proverbially known fact is that due to the highly development of industrialization and civilization, the proportion of carbon dioxide in the atmosphere increases obviously, which, as the main reason, leads to the global warming that threatens the biologic balance of the earth. Many species suffered from the consequence elicited by human activities such as the goat living on the Tibet plateau, whose habitant were greatly limited because the grassland were burnt to become farmland, or the fish in the southwest of the Pacific ocean, which were forced to emigrate away due to the increasing temperature of the sea caused by green house effect. In such cases, animals are in danger of extermination since it is hard to find a new habitant that suitable for them to settle down. So we human beings are surely accountable of the extinction of species, or at least the accelerating rate of species extirpation.
Furthermore, the diversity of livings plays a crucial role in the development of mankind. Some people may argue that we are dominating the whole world by intelligence and technology and the variety of species makes no sense. However, retaining the variety of crops, people can find a more productive breed with the hybrid cultivation of different kinds, and by protecting some endangered, precious insects pharmacists can do the research of medicine that fight against diseases. In fact it is the diversity of species that constitutes the food cycle on the earth. If a single fragment of it disappeared, the chain might not be a circular, balanced system and may cause the collapse of the whole biosphere.
Therefore, the hinge of this problem lies on the measures that we can help to retard the process of the extinction of species. On the contrast of the speaker's opinion, I sincerely concede the idea that it is merited to spend plenty of efforts and money on the work of saving endangered species. Besides the importance of biologic diversity, it is our responsibility to redeem the pollution and destruction that can be attributed to human processes.

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