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We 've got a $ 12 trillion capital investment in the world energy economy and a turnover time of 30 to 40 years , '' said John P. Holdren , a physicist and climate expert at Harvard University and president of the American Association for the Advancement of Science . ''
 person of company: John P. Holdren, Harvard University
Given a phrase that describes the relationship between two words, extract the words and the lexical relationship between them. The output format should be "relation1: word1, word2; relation2: word3, word4". 
Option: ethnicity, place lived, geographic distribution, company industry, country of administrative divisions, administrative division of country, location contains, person of company, profession, ethnicity of people, company shareholder among major shareholders, sports team of location, religion, neighborhood of, company major shareholders, place of death, nationality, children, company founders, company founded place, country of capital, company advisors, sports team location of teams, place of birth 
Text: {0} 
Answer:
 person of company: John P. Holdren, Harvard University