Robinson said keeping girls in school was one of the most important things policymakers could do to address the coming challenges of an ever­increasing population，predicted by the United Nations to reach 7 billion soon.“European countries are concerned about aging populations，but this is much less of an issue than the huge number of people which we are going to see over the next 40 years when the population goes from 7 billion to 9 billion，”she said.“Almost all of that increase will be in poor developing countries，so that we have a very big challenge.”

　　Family planning experts worry in particular about the future population explosion in Sub­Saharan Africa.In May，the United Nations projected the world population would reach 9.3 billion in 2050 and 10.1 billion by 2100.Much of that growth will come from Africa，where the population is growing at 2.3 percent a year—more than double Asia’s 1 percent growth rate.If that rate stays consistent，which is not certain，Africa’s population will reach 3.6 billion by 2100 from the present 1 billion.

　　Joel Cohen，a professor of population studies at Rockefeller University and Columbia University in New York，said universal secondary education offered a way to reduce population in high birth rate regions.In addition to providing information about birth control，a secondary education teaches women to reduce their own fertility，improve the health of their children and allows them to move from a mindset of having many children in the hope that some will survive to improve the quality of each child’s life，Cohen wrote in the journal Nature.

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