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In 2007 , he joined several other preeminent figures in entertainment , government , the environment and more , as one of the users of the BMW Hydrogen 7 , designed to build support for hydrogen as a viable alternative to fossil fuels .
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Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
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