BBC News reports
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EU BreakUp?
The circle below shows the gross external, or foreign, debt of some of the main players in the eurozone as well as other big world economies.
Eurozone debt web: Who owes what to whom?
22 December 2011 Last updated at 05:59 ET World leaders probably spent more time worrying about the eurozone crisis than anything else in 2011.
What really caused the eurozone crisis?
Greeks reject 'impossible' German plan for budget veto
29 January 2012 Last updated at 17:30 GMT Greeks are already unhappy about outside interference in their economy