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Six Billion Plus explores world population growth and its implications for the twenty-first century. With a population currently exceeding six billion and expected to reach ten billion by mid-century, the world's demographic situation is more critical than ever, by almost any measure. While the developed world faces its own problems with an aging population and population decline, most of the growth will occur in the developing world. And so the strongest factors shaping the global environment in the decades to come will include population fertility, social and economic impacts of the HIV/AIDS epidemic, legal and illegal immigration, and refugees. The implications are enormous; population growth exacerbates food and resource scarcities, places pressure on institutions, and promotes the potential for conflict. Drawing on a geographical perspective and using examples from around the world, this compact, illustrated, and accessible text is ideal for population courses in geography as well as in areas such as economics, sociology, and politics.