Mayor Rahm Emanuel on Wednesday called for a new tax on city water and sewer bills to stabilize the city's largest pension fund, a move he portrayed as his latest tough decision to secure Chicago's financial future. Emanuel's plan, which would increase the average water and sewer bill by 30 percent over the next four years, was quickly met with resistance from some aldermen who argued the city would be better off adding business taxes or even raising property taxes again to come up with the hundreds of millions of dollars a year needed to keep the city's municipal workers'...