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The Dirty Energy Dilemma : What ’s Blocking Clean Power in the United States is a 2008 book by academic Benjamin K. Sovacool , published by Praeger .
 Benjamin K. Sovacool
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Benjamin K. Sovacool