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He is a recipient of the James B. Macelwane Medal from the American Geophysical Union ( AGU ) and a fellow of the Union , a designation conferred upon not more than 0.1 % of all AGU members in any given year .
 American Geophysical Union
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 American Geophysical Union