Citi now sees 3.8% global growth this year, 3.3% in 2012.

Some members may leave currency union amid financial turmoil.

Some members may leave currency union amid financial turmoil.

German, French leaders rule out issuing euro bonds or expanding the bailout fund.

German, French leaders rule out issuing euro bonds or expanding the bailout fund.

As crisis intensifies, leaders debate role of bondholders in Greek bailout.