English:
新闻
词汇
实用
CET
BEC
TOEFL
IELTS
作文
故事
笑话
娱乐
行业
学习
生活
工作
法律
口语
阅读
写作
语法
全站导航:
资讯
作文
诗词
文学
励志
教材
板报
语文
数学
英语
物理
化学
生物
政治
地理
历史
考试
论文
范文
计划
国学
高校
短信
教程
English
简历
幼儿
字典
词典
成语
QQ
PPT
试题
课件
教案
求学网 >> English >> 科普读物

世界人口

The World Population 

导读:当前地球上的人口迅速增长的压力是一个非常重要的全球性问题,作者用具体的数字说明了这一点。

A very important world problem--in fact, I think it may be the most important of all the great world problems which face us at the present time--is rapidly increasing pressure of population on the land.  

Suppose we first take a look at the map of the world. The position today is very different from what it was only, shalI we say, 150 or 200 years ago. If we go back to that time, there were large parts of the world which had not then been explored(开发). For example, Australia was unknown; the great west of Canada and the United States had not been opened up; the heart of South America was almost entirely unknown;and on the map of the period you will find the heart of Africa is just marked as unexplored.  

The position at the present day is absolutely different. We now know roughly the actual extent of the earth's surface. Even the outline of the Antarctic continent(南极洲) is shown in a solid line on the latest maps. It is only in the last two or three years that we have been able to remove the last doubtful lines, and have settled down to the idea that the earth's land surface is something fixed,and will not extend any more. 

But what about population? The population of the world today is about 6000000000. That is an enormous number, yet it is known quite accurately, because there are very few parts of the world which have not carried out a modern census(人口普查). China was the big unknown quantity untill 1953, when a census was carried out. The population is over 1200000000. 

The important thing is not so much the actual population of the world,but its rate of increase. It works out to be about 1.6 percent annual net increase. In numbers this means something like forty to forty-five million additional people every year. Canada has a population of twenty million--rather less than six month' s increase in world population. Take Australia . There are ten million people in Australia . So it takes the world less than three months to add to itself a population which peoples(vt. 使住满人) that vast country. Let us take our own crowded country, England and Wales --forty-five to fifty million people. This is just about a year's supply.  

By this time tomorrow, and every day, there will be added to the earth about 120,000 extra people--just about the population of the city of York .

This enormous increase of population will create immense problems. By AD. 2020, unless something terrible happens, there will be as many as 7000000000 people on the surface of the earth! So this is a problem which you are going to see in your lifetime.


展开阅读全文

1 2 3 4 5

下载此内容:世界人口.docx

相关信息:

世界节日(31)World Population Day(世界人口日)

World Population Day July 11, 2004 2004 marks the 10th anniversary of the groundbreaking International Conference on Population and Development (ICPD) in Cairo, Egypt, in 1994. Ten years ago, on the e...(查看全文

加拿大的事

A:Ben,tell me something about Canada,will ya?   Ben,给我将点儿加拿大的事儿吧   B:No problem.But Canada is such a big country.What do you wanna know?   没问题,可加拿大是个大国,你想知道什么呢? ...(查看全文

人口增长对野生动物的影响

人口增长对野生动物的影响[2.图画/图表描述段] 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 spec...(查看全文

Traffic and population-交通和人口

Traffic and population1. 交通问题已经成为大城市的主要问题之一。2. 快速增长的人,是造成交通问题的原因。3. 应采取措施解决这个问题。 Traffic problems have become one of the major problems in cities. Stre...(查看全文

Population Control-控制人口

Population Control1.科学的进步和生活条件的改善导致了世界人口的迅速增加。2.但是人口过分增长会对人类社会的存在构成威胁。3.为了保证人类社会的稳定发展……。Progress in science and the improvement of li...(查看全文

相关栏目导航

资讯 作文 诗词 文学 励志 教材 板报 语文 数学 英语 物理 化学 生物 政治 地理 历史 考试 论文 范文 计划 国学 高校 短信 教程 English 简历 幼儿 字典 词典 成语 QQ PPT 试题 课件 教案