From nowadays, the world have more and more people, somebody say that when in 2015, the population of the world will achieve about 70 billion. General to say, developing country have much more population and increase than the advance country. The population have brouht many seniors problem ,for example :traffic jams，pollution of the environment，the resources are not enough for us,and so...[繼續(xù)閱讀]

    It is reported that the world’s population was 6 billion in the year 2,000,and it is growing faster and faster.The world’s population problem is the greatest one because it brings lots of problems,such as water resources problem,more and more people losing their jobs and so on.These problems are mainly in the developing countries because the population of the developing countries is ove...[繼續(xù)閱讀]

    To begin with, as the population grows, people consume much more natural resources, which often leads to excessive hunting. Second, with the increase of human activities, modern people take up more and more space. Which has a great impact on other species. Finally, the problem of pollution becomes more and more serious with the development of modern industry. More and more animals have to a...[繼續(xù)閱讀]

    Everything grows in modern times, and it seems that nothing grows as quickly as population. Population keeps growing, and grows rapidly, firstly because people‘s living standards keep going up, with better houses, better clothing, better food, secondly because people know how to preserve themselves so as to live longer, and thirdly 　　because they have modern medicine and medical care...[繼續(xù)閱讀]

    The human race has experienced a consistent increase in population since the beginning of its history. Famine and disease have done little to offset this steady increase. Too many people are added annually to the population of the world. So both the causes of population increase and the results of having more people are worth careful study. 　　Culture evolution is the major factor respo...[繼續(xù)閱讀]

    nothing in today‘s world is as big a problem as that of population. people begin to worry about the support capacity of the earth. and there might be only standing room for each person in the future. 　　lima‘s population was 5. 7 million in 1985 but it grew to 9. 1 million in 2000. tianjin‘s was 7.9 million in 1985. in 2000, it boosted to 9. 7 million. such cities as london, osaka...[繼續(xù)閱讀]

    From these graphs, we can draw a conclusion that, with the growth of human population, the number of species has decreased rapidly in America, and some species have even vanished from our planet. 　　Why does this phenomenon appear? There are several possible reasons for this. Above all, as the human population grows rapidly, a growing number of people came to live where some wild specie...[繼續(xù)閱讀]

    Many countries will experience aging populations in the next century because of declining birth and mortality rates. China will soon join their ranks. According to statistics, the aging of China‘s population will approach its peak by the middle of the next century,with the percentage of the people aged beyond 60 making up 27.4 percent of the total. That means one out of every four people...[繼續(xù)閱讀]

    Many countries will experience aging populations in the next century because of declining birth and mortality rates. China will soon join their ranks. 　　As for the issue of aging, its situation has been growing increasingly severe in spite of the fact most people are still ignorant of the problems it brings about. Firstly, with families becoming smaller and living pace escalating, it i...[繼續(xù)閱讀]

     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 exer...[繼續(xù)閱讀]