The top of the Hoover Tower is seen through trees at Stanford University in Stanford, California May 9, 2014. Few if any of the big U.S. pension or college endowment funds appear ready to follow in ... more 
The top of the Hoover Tower is seen through trees at Stanford University in Stanford, California May 9, 2014. Few if any of the big U.S. pension or college endowment funds appear ready to follow in Stanford University's footsteps and pull their money out of shares of coal miners or other fossil fuel producers. Officials from the pension systems for California's public employees and schoolteachers and New York public employees, the three largest U.S. retirement funds, told Reuters they prefer to work with their portfolio companies to improve their behavior rather than divest them. To match story FOSSILFUEL-DIVESTMENT/ REUTERS/Beck Diefenbach (UNITED STATES - Tags: POLITICS EDUCATION BUSINESS SOCIETY) less 
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Reuters | Photo By BECK DIEFENBACH / REUTERS
Fri, May 9, 2014 8:10 PM EDT