The world has reached a somewhat ( worry) demographic (人口统计学的) milestone. A spokesperson said the U. S. Census Bureau (人口统计局) estimated that the (globe) population surpassed 8 billion on the 26th of September., he said this was a very rough guess and the precise day could be a month or two either side of this date. The world population had doubled between 1960 and 2000, and (grow) from 6 billion to 8 billion in the past two decades. The rate of growth is slowing birth rates are falling in many nations.
According to the Census Bureau, trends of longer lifespans and lower birth rates result the slowdown in population growth. However, it forecast that the population would reach 10. 2 billion in 2060. It said: "The world population is projected to keep growing despite (decline) birth rates. In fact, we estimate number of infants already peaked in 2017. Instead, population growth in the future will come from larger groups of people at adult ages." It added: "Population growth is the result of birth rates, mortality (死亡率), migration and the share of the population at certain ages. Nearly three quarters (74 per cent) of the earth's population (resident) in countries birth rates are around or below the replacement level."
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