Dow Jones: Investor groups representing $13 trillion in assets Thursday urged the U.S. and other governments to put in place stronger policies to curb climate change, warning political uncertainty surrounding the issue stunts development and exposes companies to considerable risk. Four investor groups, made up of more than 200 institutional investors such as the California Public Employees’ Retirement System, or Calpers; Deutsche Bank AG (DB); and HSBC Holdings PLC (HBC), called for short- and …