This undated photo shows Ralph J. Cicerone, president emeritus of the National Academy of Sciences and a renowned authority on atmospheric chemistry and climate change, in Washington. Cicerone has died at age 73. William Kearney, director of media relations for the Washington, D.C.-based National Academies of Sciences, Engineering, and Medicine, said Cicerone died unexpectedly at his home in Short Hills, New Jersey, on Saturday, Nov. 5, 2016. (Mark Finkenstaedt/National Academy of Sciences via AP)
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