President-elect Barack Obama on Jan. 20 will become the most important leader of a species that has exploded in just six generations from a total population of 1 billion (around 1830) to a point today when teenagers alonenumber 1 billion, a species that is on a path toward more or less 9 billion people by mid-century. In numbers, think roughly of adding two Chinas on top of the one that exists today.
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