Applying the most conservative estimates to current demographic trends, the human population will increase by about three billion people by then.
按照对目前人口趋势的最保守估计，到那时人口将增加约30亿人。
It is the fast growth period that the number and the formation of the elder in China in the 21st century. The proportion of the elder in the total population will increase gradually.
21世纪，是我国老年人口数量及人口老龄化的快速增长时期，老年人口在社会总人口中的比重将逐渐增大。
The USA will increase, from 2010-2030, its population by 20% through immigration.
从2010年到2030年，美国将通过移民使其人口增加20%。
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