Bill McKibben, founder of 350.org, right, speaks to a crowd of college students and supporters at a rally to support fossil fuel divestment outside of City Hall in San Francisco, Thursday, May 2, 2013. Hayden Higgins, left, rides a Rock The Bike "One Bike/One Speaker," a bicycle that generated power for the sound system at the rally. (AP Photo/Jeff Chiu)

Associated Press
Bill McKibben, founder of 350.org, right, speaks to a crowd of college students and supporters at a rally to support fossil fuel divestment outside of City Hall in San Francisco, Thursday, May 2, 2013. Hayden Higgins, left, rides a Rock The Bike "One Bike/One Speaker," a bicycle that generated power for the sound system at the rally. (AP Photo/Jeff Chiu)
Bill McKibben, founder of 350.org, right, speaks to a crowd of college students and supporters at a rally to support fossil fuel divestment outside of City Hall in San Francisco, Thursday, May 2, 2013. Hayden Higgins, left, rides a Rock The Bike "One Bike/One Speaker," a bicycle that generated power for the sound system at the rally. (AP Photo/Jeff Chiu)
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