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The term population explosion is usually applied to the rapid growthof population over the last three centuries.In the two hundred vears from1650 to 1850£¬world population doubled and reached its first billion.In thenext eighty years£¬it doubled again£¬and by 1975£¬it had doubled once moreto a total of 4 billion.By the year 2000£¬it is estimated that it will exceed 6billion and possibly approach 7 billion unless there is a maior reduction inbirth rates or a major increase in death rates.
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£¨1£©Êý¾Ý1£º1650¡ª1850£»double£¬reach 1 billion.
£¨2£©Êý¾Ý2£º1850¡ª1930£»double again£¬reach 2 biilion.