Setting aside the big overhanging worries of the U.S. fiscal cliff and the eurozone crisis, plenty of other fundamental problems are casting a pall over prospects for the global economy in the new year, says economist Nouriel Roubini. Roubini notes recession across Europe, unsustainability of economic expansion in China and other emerging markets, sustained slow growth in the U.S. and generally high price-earnings ratios in stock markets that render them sensitive to external shocks.