Thinking the unthinkable -- a euro zone breakup

Reuters reports:

Contagion spreads from Ireland to Portugal and then to Spain, forcing European leaders to exhaust the $1 trillion bailout fund they set up only half a year ago to defend their ambitious single currency project.

Sniping within the 16-nation euro zone mounts and popular support for the euro erodes as German taxpayers rebel against a series of costly rescues and austerity fatigue in the bloc's periphery reaches breaking point.