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Italian Prime Minister Silvio Berlusconi smiles on November 4, 2011 before the G20 Summit of Heads of State and Government in Cannes. The leaders of the world's most powerful economies meet for a G20 summit on November 3 to confront a European debt crisis that threatens to plunge the global economy into renewed recession. Under pressure from economic powerhouses China and the United States to put their own house in order, European leaders issued debt-laden Greece with an ultimatum on the eve of the summit taking place in Cannes, France. AFP PHOTO POOL MICHEL EULER