Quick: What are the "three Fs" of investing? Fossil, fuel and free.

Students on dozens of campuses have been demanding that their universities divest themselves of fossil fuel companies. A handful, from Unity College in Maine to San Francisco State University, have vowed to do so. The movement isn't limited to campuses, either. Seattle committed to fossil fuel free operations last December, and other cities have followed in the past month, including Northampton, Mass.