The world economy will slow sharply this year and next, with the United States likely sliding into recession reflecting mounting damage from the most dangerous financial jolt in more than a half-century.

The International Monetary Fund, in a World Economic Outlook released on Wednesday, slashed growth projections for the global economy and predicted the United States - the epicenter of the financial meltdown - will continue to lose traction. "The world economy is now entering a major downturn in the face of the most dangerous shock in mature financial markets since the 1930s," the IMF said in its report.

The IMF now projects that the global economy, which grew by a hardy 5 percent last year, will lose considerable speed, slowing to 3.9 percent this year. It is forecast to weaken even more - to just 3 percent - next year, marking the worst showing since 2002. In the past, the IMF has called global growth of 3 percent or less the equivalent to a global recession.