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Their study was featured in the IPCC Second Assessment Report , and in the United States House Committee on Science its findings were disputed by Pat Michaels .
 IPCC, Science, Pat Michaels
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 IPCC, Science, Pat Michaels