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In this Oct. 12, 2011 photo, a shopkeeper sits on boxes as he waits for transportation at a busy wholesale market in New Delhi. Already the second most populous country, with 1.2 billion people, India is expected to overtake China around 2030 when its population soars to an estimated 1.6 billion.

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Challenges loom as world population hits 7 billion

By the time Godelive Ndageramiwe's ninth child arrives in Burundi, and any further members of the Ahmed Kasadha clan in Uganda, the world's population will have passed a momentous milestone. As of Oct. 31, according to the U.N. Population Fund, there will be 7 billion people sharing Earth's land and resources. In sub-Saharan Africa, the demographic news is mostly sobering as the region staggers under the double burden of the world's highest birthrates and deepest poverty.

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