AP story, includes “Chicago's four pension systems are about $28 billion short of promised benefits, prompting Emanuel's financial team to consider a risky fix: borrowing more than $10 billion by issuing bonds to help lower that debt. … But experts say pension obligations bonds are risky because investments could fail or the stock market could falter. … Emanuel has sought to fix the problems, raising the amount that Chicago pays into the pensions every year, though still far short of what is owed. The city has increased taxes by more than $820 million since 2015 to boost contributions to the pension funds.”