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The world has never seen anything like the population explosion of the past century. The United Nations projects that the global population will top 9 billion by 2050 and 10 billion by 2100. But these projections are uncertain, as they depend on assumptions about the future, such as how many children a woman will have 20 or 30 years hence. This video, part of Science’s 29 July 2011 special issue on Population, highlights demographic trends around the globe, which offer a window into what our future world may look like.