![]() Population debates like this are why, in 2011, National Geographic published a series called "7 Billion" on world population, its trends, implications, and future. Who is right? We'll know in a hundred years. Another study in the journal Global Environmental Change projects that the global population will peak at 9.4 billion later this century and fall below 9 billion by 2100, based on a survey of population experts. These researchers used a new "probabalistic" statistical method that establishes a specific range of uncertainty around their results. As National Geographic's Rob Kunzig writes here, a new United Nations and University of Washington study in the journal Science says it's highly likely we'll see 9.6 billion Earthlings by 2050, and up to 11 billion or more by 2100. This week, two conflicting projections of the world's future population were released. ![]() ![]() The question of how many people the Earth can support is a long-standing one that becomes more intense as the world's population-and our use of natural resources-keeps booming. There are more than 7 billion people on Earth now, and roughly one in eight of us doesn't have enough to eat.
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