7 Billion And Counting: World Population Hits A MilestoneAs Earth's human population hits 7 billion, there's little agreement on what its future growth will look like. And different countries all face their own challenges to maintain a stable, productive population.
Indian schoolchildren write English alphabets on slates at a primary school outside Hyderabad in June. India is on track to overtake China as the most populous nation in just 16 years.
Noah Seelam/AFP/Getty Images
Sharing a hillside with high-rise apartment dwellers, children dance at a shop in one of the squatter communities that ring Caracas, a city of 3 million. Today, one in seven people live in slums. Providing them with better housing and education will be one of the great challenges facing a world of 7 billion people and counting.
Jonas Bendiksen/Magnum Photos