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In 2006 attorney and mechanical engineer Peter W. Huber asserted that the world was just running out of " cheap oil " , explaining that as oil prices rise , unconventional sources become economically viable .
 Peter W. Huber
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:
 Peter W. Huber