英语翻译Many of the world’s pollution problems have been caused

英语翻译
Many of the world’s pollution problems have been caused by the crowding of large groups of people into the cities.Supply for the needs of the people leads to further pollution by industry.If the rapid increase in human population continues at the present rate,there may be much greater harm.Some scientists speak of the increase in numbers of people as“population pollution”.About 2,000 years ago,the world population was probably about 250 million.It reached a billion in 1850.By 1930,the population was two billion.It was three and a half billion by 1980.It doubled by the year 2000.If the population continues to grow at the same rate,there would be 25 billion people in the world a hundred years from now Man has been using the earth's resources more and more rapidly overthe years.Some of them are almost gone.Now many people believe that man's greatest problem is how to control the growth of his own population.The materials in the worldwill not support the human population,in time to come,if the present rate of increase continues.Already there is overcrowding in the cities andhunger in some countries.Can man's rate of increase continue?Many people believe that human survival in the future depends on the answer to this question.

世界上很多的污染问题是由于过多的人口进入城市所造成的.为了满足人民的日常需求,工业会会对环境造成进一步的污染.如果人口按照目前的增长率继续增长,环境会受到更大的污染.一些科学家将人口的持续增长称作“人口污染”.大概在2000年前,世界上的人口大概为250000000,在1850年达到了10亿,到了1930年,世界人口为20亿.到了2000年,世界人口又翻了一番.如果人口持续按照同样的增长率增长那么从现在开始到100年后世界上的人口会到达250亿.人们在飞速的消耗地球上的种种资源,一些资源甚至已经消失了.很多人都认为人类的当务之急是控制人口的增长速度.人口若继续按当前的增长速度继续增长,假以时日,地球上的资源将供不应求.在一些国家的城已经出现了过多的人口和饥荒.人们的增长速度还会持续么?很多人认为这个问题的答案决定了人类在将来是否能存活.