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World leaders have begun to gather in Cannes for the G-20 summit. The Greek prime minister, George Papandreou, will be facing tough questions over his decision to call a referendum on the bailout package announced last week. Can Europe save the Greek economy? Can the eurozone save itself? Where is economic growth going to come from?

Also, the Arab League says Syria has agreed to a plan to end months of bloodshed. Will the opposition accept it?

On the World Tonight, with Robin Lustig.