"Climate scientists encountered Lorenz's ideas in 1965, when he gave the keynote address at a conference in Colorado called "The Causes of Climate Change," the first big scientific gathering devoted to the subject. As he described the instability he had uncovered, his audience made the connection with carbon dioxide. Conference organizer Roger Revelle, who had been skeptical, was persuaded. If small changes in initial conditions could have enormous long-term effects, he said in a summary speech, then perhaps tiny rises and falls in atmospheric carbon dioxide could " 'flip' the atmospheric circulation from one state to another." Arrhenius and Callendar had been vindicated. A scientific consensus was emerging: a tiny shift in the atmosphere's carbon dioxide load could make Earth hard to live on. And Keeling had shown that carbon dioxide levels were rising in exactly the way that might lift temperatures to new heights. Revelle was then on a panel charged by the U.S. president with writing a report about environmental pollution. He took advantage of the position to create a subpanel on carbon dioxide and write the first-ever official government report about the possibility of climate change."