After a tumultuous August, pension funds for companies, governments and unions are falling further under water, raising pressure on boards to take on more risk at a time when the economic and policy outlook has never been more uncertain.

Cash

Entering 2011, pension plans for companies in the S&P 500 were just 75 percent funded, down from 85 percent in 2010 and roughly 78 percent following the Lehman collapse, according to Goldman Sachs. Funding levels—likely even uglier on a municipal and union level—just got worse.