Biological diversity has never been so threatened as it is today as a result of the process of human civilization. The various forms of pressure created by human activity have destroyed natural balance, led to the deterioration of natural habitats, genetic erosion and the rarity, even disappearance, of a number of plant and animal species.
As the pace of civilization accelerates, more people, taking more space, needing to use more natural resources, engaging in ever-growing consumption, impose severe deterioration on the habitat of animals. An increasing number of people come to realize that the disappearance of animals will result in serious threat to the equilibrium of ecosystem. Simply put, the extinction of hawks, a rat-eating bird seen in many regions, will result in the rapid propagation of rats. And rats, further, will destroy the prairies and threaten the other animals like gazelles, zebras and others, who live on grass and green lands. The coexistence of animals and human beings creates perfect harmony and brings about the vividness to our planet.
It is hard to imagine what our world would be like without animals. Sociologists also point out that the disappearance of animals can cause social and economic problems. Animal trade, as a supporting sector to the world economy, was very active before. However, the situation is beyond control since animal trade is very profitable and alluring. Many species cannot escape the adversity of being killed.
Certainly, our diet cannot be without meat. There are living stocks, which can provide us with sufficient and nutritious produce. Therefore, we need not to resort to wild animals, especially the endangered ones. To protect animals is to protect our living environment. Every individual should join efforts to keep the diversity of animals.
上一篇: 雅思写作范文:学生应自付全部学费吗
上海牛津版一年级英语Unit 9 Revision单元分析教案
一年级英语下册Unit2 Small animals第三课时教案
一年级英语教案Module1 unit6 Mid-Autumn Festival
沪教版小学英语一年级下册教案unit1课时2
牛津版一年级英语上册unit5 Fruit教案(1)
上海牛津版一年级英语下册Unit3 Colours教案(1)
沪教牛津版小学英语一年级上册 Unit3 period2教案
牛津版小学一年级英语上册Unit1 Hello教案
沪教牛津版一年级英语上册教案Unit1 My classroom第二课时
沪教版小学英语一年级下册教案unit1课时6
上海牛津版一年级英语下册Unit2 Small animals第五课时教案
上海版牛津一年级英语教案 Unit 3 My abilities
上海牛津版一年级英语下册Unit9 Revision第二课时教案
上海牛津版一年级英语Unit7 My family教案
上海牛津版一年级英语Unit3 This is my mum教案
新起点小学一年级英语教案Unit7 Fruit
新起点小学一年级英语下册Unit11 Toys教案
沪教牛津版小学英语一年级上册 Unit3 period1教案
小学一年级英语下册Unit2 Small animals教案1
上海版牛津一年级英语教案Unit8 Playtime(总五课时)