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"Top
scientist's fears for climate" One of America's most well-respected scientists has said the world has already entered a state of dangerous climate change. Profeesor John Holdren, president of the American Association for the Advancement of Science, outlined his concerns. John Holdren, in addition to his presidency of the AAAS, is director of the Woods Hole Research Center, and the Teresa and John Heinz Professor of Environmental Policy at Harvard University.
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