The Organization for Economic Cooperation and Development warned on Monday that without decisive action the global economic outlook is gloomy. In a note released ahead of the Group of 20 Cannes Summit, OECD Secretary-General Angel Gurria said, "Much of the current weakness is due to a generalized loss of confidence in the ability of policymakers to put in place appropriate responses." "It is therefore imperative to act decisively to restore confidence and to implement appropriate policies to restore longer-term fiscal sustainability at a pace that depends on the size of the fiscal challenge as well as the state of the economy and to strengthen long-term growth." The Paris-based think tank expects G20 countries to grow nearly 3.9 percent this year, 3.8 percent in 2012 and 4.6 percent in 2013. The group cut its 2011 forecast for the U.S. economy to 1.7 percent from 2.6 percent. Next year, growth in the world's biggest economy is seen at 1.8 percent, far weaker than an earlier projection of 3.1 percent The Eurozone growth forecast for this year and next was lowered to 1.6 percent and 0.3 percent, respectively. In May, the group had forecast 2 percent growth each for these two years. The OECD noted that uncertainties regarding the short-term economic outlook have risen dramatically in recent months. The group expects many events, largely linked to euro area debt crisis and the U.S. fiscal policy, to dominate the economic scene in the next two years. Regarding the measures agreed by EU leaders on October 26, the OECD said these measures go in the right direction and could help restore confidence and create positive feed-back effects that could trigger a scenario of stronger growth. The group urged the leaders to implement the steps agreed "promptly and forcefully". The research group also urged central banks in advanced G20 economies to keep interest rates unchanged or reduce them where possible. The OECD stressed that the European Central Bank should reduce the rates and continue to provide ample liquidity including through unconventional measures if risks intensify.