英语翻译If the population of the earth goes on increasing at its

英语翻译
If the population of the earth goes on increasing at its present rate,there will eventually not be enough resources left to sustain life on the planet.By the middle of the 21st century,if present trends continue,we will have used up all the oil that drives our cars,for example.Even if scientists develop new ways of feeding the human race,the crowded conditions on earth will make it necessary for lus to look for open space somewhere else.But none of the other planets in our solar system are capable of supporting life at present.One possible solution to the problem,however,has recently been suggested by American scientist,Professor Carl Sagan.
Sagan believes that before the earth's resources are compleetely exhausted it will be possible to change the atmophere of Venus and so create a new world almost as large as earth itself.The difficult is that Venus is much hotter than the earth and there is only a tiny amount of water there.
Sagan proposes that algae organisms that can live in extremely hot or cold atmospheres and at the same time produce oxygen,should be bred in condition similar to those on Venus.As soon as this has been done,the algae will be placed in small rockets.Spaceship will then fly to Venus and fire the rockets into the atmosphere .In a fairly short time,the alge will break down the carbon dioxide into oxygen and carbon.
When the algae have done theri work,the atmosphere will become cooler,but befor man can set foot on Venus it will be neccessary for the oxygen to produce rain.The surface of the planet will still be too hot for man to land on it but the rain will eventually fall and in a few years something like earth will be reproduced on Venus.

如果地球的人口继续以目前的比率增加,最终不会有足够的资源来支撑这个星球上的生命.例如,如果继续目前的趋势,到21世纪中期为止,我们将用光发动我们的汽车的所有石油.尽管科学家们研发了新的供给人类的方法,在地球上拥挤的状况对于我们来说寻找其他开放的空间是有必要的,但是目前在我们的太阳系中没有其他的行星有维持生命的这个能力.然而这个问题的一个可能的解决办法近来由美国科学家卡尔.萨根提出了建议.萨根相信在地球资源完全枯竭之前,有可能改变金星的大气并且创造出几乎和地球本身一样大的的新世界.困难是金星比地球热多了并且在那只有微量的水.萨根提议在与金星相似的条件下种植能够在极其冷或热的空气中生存并同时制造氧气的藻类生物.这件事一做完,就把这个藻类安放在小火箭中.然后宇宙飞船飞往金星把火箭发射到金星的空气中.在相当短的时间内,藻类会把二氧化碳分解成氧和碳.
当藻类做完它们的工作时,空气将会变得较凉爽,但是在人类登上金星前,对于氧来说产生雨是有必要的.这个星球的表面对于人类太热了还不能登陆,但是最后会降雨,在几年后,像土壤一样的东西会在金星上被复制.