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In April 2011 TVA reached an agreement with the Environmental Protection Agency ( EPA ) , four state governments , and three environmental groups to drastically reduce pollution and carbon emissions .
 TVA, Environmental Protection Agency, EPA
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 TVA, Environmental Protection Agency, EPA