Dominique Strauss-Kahn, head of the International Monetary Fund, said the global economic recovery remains "beset by great uncertainty". Strauss-Kahn cited slow growth and high unemployment in rich nations, Europe's sovereign-debt crisis and climbing commodity prices. "Great uncertainty still prevails," Strauss-Kahn said. "Indeed, numerous black swans are now swimming in the global economic lake." The IMF, the World Bank and finance ministers from the Group of 20 nations are scheduled to meet in Washington, DC, next week.