Colby Cosh remembers Carl Sagan.:

He continued to expound the gospel even as improved modelling showed that the likely effect would be closer to “nuclear autumn.” But his fancies came to an end in 1991 when he warned Western governments that ignition of the Kuwaiti oil fields by Saddam Hussein would be certain to induce the equivalent of nuclear winter. When Saddam lit the match, it was only Sagan’s prestige that fell to below zero. In his 1996 book The Demon- Haunted World, he all but acknowledged that his own “baloney detector” had suffered interference from his personal politics. Yet contemporary iconographers now claim that Sagan’s hypothesis, though wrong, frightened Mikhail Gorbachev so badly that Sagan can be credited with playing a “role” in ending the Cold War. (If you believe what the Soviet generals have to say on the subject, Ronald Reagan’s investments in missile-defence research — which Sagan fought to the point of civil disobedience– were more persuasive.)