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FIGURE II Global to local perspectives on the geometric growth of the human population. (Top) Global human population (in billions) since 1750, in industrialized and developing nations, with projected global population sizes in the 21st century reaching nearly 9 billion. Most of the global human population increase during this period has been in developing countries such as India, which alone grew from 375 million to 1 billion between 1947 and 1999. (Middle) United States human population (in millions) since 1790. (Bottom) Within the United States, state human populations (in ten thousands) for California and Ohio as representative coastal and midcontinental localities, respectively. Population statistics are from the United Nations Population Information Network (http://www.undp.org/popin) and the United States Census Bureau (http://www.census.gov/population/www).

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