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This web article is a March 2000 report from Why Files about the risk of a catastrophic impact from space objects such as asteroids and comets. It cites a presentation at a national scientific meeting, which stated that asteroid impacts over the past 10,000 years had a hand in shaping the climate and the nature of civilization itself. Why Files staff interviewed seven scientists, both pessimists and optimists, on the hazard for this report.
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