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It was one of the largest public demonstrations in US history. On June 12, 1982, an estimated 750,000 protesters thronged Central Park in New York City, chanting "No nukes!" and bearing signs reading "Reagan is a bomb -- both should be banned" and "Arms are for embracing." Some demonstrators called for unilateral US disarmament, others for renewing arms control talks with the Soviet Union. It was a diverse coalition that had been pulled together by Ken Caldeira, a 25-year-old activist and computer geek. Back then he was paying the rent doing software consulting on Wall Street, but his passion for the environment would eventually lead him to become one of the nation's leading experts on global warming. Around the same time, at the Lawrence Livermore National Laboratory near San Francisco, Lowell Wood -- then 41 and a protégé of the brilliant and controversial hydrogen bomb inventor Edward Teller -- was leading a secretive team of young geniuses called the O Group. They weren't merely working with the nukes that Caldeira and his fellow peaceniks reviled; they were dreaming up new and expanded uses for them. One plan called for channeling the energy of a hydrogen bomb into laser blasts that could theoretically destroy enemy ballistic missiles from outer space. It sounded crazy, but Wood and Teller's ideas inspired President Reagan's famous March 23, 1983, "Star Wars" speech introducing the Strategic Defense Initiative, the bane of arms-control advocates everywhere. What's surprising, then, is that today, 25 years later, Caldeira, the left-wing environmentalist, calls Wood, the Cold Warrior and Star Wars proselytizer, "one of my best friends." Recently, they have collaborated on strategies for a process known as geoengineering....
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