FILE - In this Nov. 21, 2008, file photo, Wallace Smith Broecker, a professor in the Department of Earth and Environmental Sciences at Columbia University in New York, addresses the audience during the Balzan prize ceremony in Rome. Broecker, a climate scientist who popularized the term "global warming," has died. He was 87. Columbia University said the longtime professor and researcher died Monday, Feb. 18, 2019, at a New York City hospital. (AP Photo/Gregorio Borgia)
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