The President and the Planet, On a Budget

From Andrew C. Revkin of The New York Times (who recently moderated the discussion on SCUP's Campus Sustainability Day 6 webcast, October 22):

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 alone number 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. Expectations that he will exert planet-scale leadership are high, as indicated in this letter from Nelson Mandela to the next president.