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Steven Chu, former U.S. Secretary of Energy , 1997 Nobel Prize winner in physics, and the new president of the American Association for the Advancement of Science . (AP Photo/Tsering Topgyal). The world economy is based on ever-increasing population, said Nobel laureate Steven Chu, a scheme that economists don't talk about and that governments won't face, a scheme that makes sustainability impossible and that is likely to eventually fail. "The world needs a new model of how to generate a rising standard of living that’s not dependent on a pyramid scheme," Chu said at the University of Chicago. Chu didn't specify what that new model would look like, but he offered a solution to the population growth the current one relies on. Full story

22 April