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In findings published Wednesday in " , researchers from the and reported that premature deaths in the United States attributable to the pollution produced by power plants were disproportionately caused by coal ; that race was a significant factor in who was affected ; and that a substantial fraction of the deaths were from pollution crossing state lines .
 United States
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: media, plant, vehicle, astronomical object, time, disease, animal, location, person, organization, mythical figure, food, biology, geographical phenomenon, instrument, event 
Text: {0} 
Answer:
 United States