【摘要】 1970~1975年世界人口出生率为30‰,2000~2005年预计降到21‰,但仍面临人口增长的压力。较发达地区人口增长率已经很低,甚至出现负增长,而最不发达国家人口增长率最高,人口规模迅速扩大。事实表明,经济越不发达的地区,人口增长速度越快。世界人口大国(亿人以上)已从1950年4个国家增加到目前的11个国家,其人口之和占世界总人口的一半以上。根据预测,到2050年世界人口大国将增加到18个。不同国家和地区的生育水平将决定着世界人口发展速度。更多还原

【Abstract】 We still face the pressure of population growth though the birth rate of world population was 30‰ in 1970～1975,and is expected to decrease to 21‰ in 2000～2005.Annual population growth rate in more developed regions has been very low,or even negative,compared with the highest in the less developed countries whose population size expands rapidly.The less developed the regions are,the more rapidly population grow.Countries with more than 100 million population have expanded to 11 at present,while there were only 4 in 1950.The total population of these countries makes up over half of the world population.The number of such countries is expected to be 18 in 2050.The fertility level of different regions and countries will determine the speed of population growth in the world.更多还原