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She has briefed officials from over two dozen governments , and was a consultant for the U.S. Department of Energy 's " Global Energy and Environment Strategic Ecosystem " .
 U.S. Department of Energy, Energy
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 U.S. Department of Energy, Energy