US Plays Down European Crisis but China Worried

European leaders have sought to deal with a crisis that has pushed many euro zone member states' borrowing costs sky high through a 110 billion euro bailout of Greece and the setting up of a $1 trillion safety net to stabilize the single currency.  But after riots on the streets of Athens and with strikes looming elsewhere, investors remain concerned about whether Europe has the political will to rein in bulging government deficits and tackle sluggish growth.  "Europe is trying to solve a debt problem with further debt," said Domenico Lombardi, president of the Oxford Institute for Economic Policy