Student and alumni protesters occupy the field at the annual Harvard-Yale football game. | Campbell Erickson/Fossil Fuel Divest Harvard More than 150 protesters demanded the schools divest themselves of fossil fuel investments. More than 150 students and alumni protesting the two institutions’ financial ties to the fossil fuel industry halted the annual Harvard-Yale football game Saturday. The demonstrators took to the field during the game’s halftime, demanding the schools sell their stakes in fossil fuel companies. As Vox’s Umair Irfan has reported, both Harvard and Yale rely on funds, bonds, and assorted financial instruments to keep their endowments strong.