文档介绍：动物灭绝 WILDLIFE EXTINCTION
WILDLIFE EXTINCTION    The . is faced with the problem of wildlife extinction. By the end of 1600, the number of extinct wildlife species was less than ten kinds. But in 1900, the number was more than 70 kinds.    There is nothing to make a fuss about the phenomenon. This is, anyway, a definite result of population growth and environment pollution. With the increase of population, people need more and more land to grow crops and more space to live. Thus, there is less and less room in the USA for wildlife to survive. With the rapid development of agriculture and in dustry, the environment is seriously polluted, which destroys the living condition of wildlife. Therefore, the phenomenonof wildlife extinction, in a sense, should draw people＇