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He is the author or editor of eight books and more than 130 peer reviewed academic articles on various aspects of energy policy and climate change , and has presented research at more than 60 international conferences and symposia .
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Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
 Entities:  
Answer:
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