currently, there is a widespread concern about the previously neglected connection between growing human population and decreasing wild species. as the two graphs obviously portrayed, american population in 1980 was 250 times than that in 1800, a trend accompanied by the extinction of nearly 70 kinds of wildlife in the past 300 years. a clear correlation is suggested that mankind has exerted a tremendously negative influence on natural species.

　　there are many factors responsible for the aforementioned tendency. first and foremost, to satisfy the space demand for the booming population, the only available solution for americans is to take occupation of forests and grassland. that used to be habitat of wild animals and plants. furthermore, the process of industrialization and urbanization has generated severe pollution that essentially destroys environment and ecosystem.

　　in my point of view, the dearth of wildlife today forecasts an unpromising future for humans tomorrow. in order to eliminate species extinction, relevant laws and regulations must be established and enforced to maintain a large portion of unspoiled areas. effective measures should also be applied to ensure that the impact of pollution be removed.