It has also lowered the trade growth projections for 2016 to 3.9 per cent from 4 per cent.
"WTO economists have lowered their forecast for world trade growth in 2015 to 2.8 per cent, from the 3.3 per cent forecast made in April, and reduced their estimate for 2016 to 3.9 per cent from 4 per cent," WTO said in a statement.
The forecast will have an adverse implication for India's exports which have been witnessing continuous decline.
The WTO said that these revisions reflect a number of factors that weighed on the global economy in the first half of 2015, including falling import demand in China, Brazil and other emerging economies, falling prices for oil and other primary commodities, and significant exchange rate fluctuations.
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"Volatility in financial markets, uncertainty over the changing stance of monetary policy in the US and mixed recent economic data have clouded the outlook for the world economy and trade in the second half of the year and beyond," it said.
"WTO members can help to set trade growth on a more robust trajectory by seizing the initiative on a number of fronts, notably by negotiating concrete outcomes by our December Ministerial Conference in Nairobi," said WTO's Roberto Azevedo.
"At the time of our last forecast in April 2015, world trade and output appeared to be strengthening based on available data through 2014 Q4.