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Noting that the typical mammalian species persists for about a million years, according to the fossil record, the writers observe that humans, who have been around for about the last 200,000 years, are in the equivalent of "mid-adolescence." Ehrlich and Pringle say that it is a "fitting coincidence, because Homo sapiens is now behaving in ways reminiscent of a spoiled teenager," mistreating its life-support systems, "mindless of the consequences." (read the full report in science daily http://www.sciencedaily.com/releases/2008/08/080811200020.htm