Two California Democratic congressmen on Wednesday urged the California Public Employees Retirement System, the largest U.S. public pension fund, to divest from oil giant ExxonMobil over its handling of the issue of climate change. Congressmen Ted Lieu and Mark DeSaulnier sent a letter to CalPERS CEO Anne Stausboll, saying it is "morally suspect" for the $300 billion pension fund "to invest in a company that engaged in morally reprehensible conduct" on climate change.