The World Economic Situation and Prospects mid-year report released today says the dip reflects a worsening in Latin America in particular as the region deals with lower commodity prices.
Overall, the forecast expects modest global growth the rest of this year and next year, which could see an improvement to 3.1 per cent.
The UN is keeping a wary eye on upcoming monetary policy changes in the United States, where the Federal Reserve is "expected to start raising interest rates in the second half of 2015," as well as uncertainty about the Greek debt crisis' effect on the eurozone and possible "spillovers" of conflicts including Yemen, Syria and Ukraine.
Around the world, the drop in prices for oil and other commodities has hurt countries whose economies largely depend on them, while commodity-importing countries benefit from being able to buy more for less. Oil prices are expected to recover slowly, the report says.
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Russia has been hit hard by the oil price decline. Its economy is expected to shrink by 3 percent this year and grow by just 0.1 per cent in 2016.
The United States, Japan and the European Union are more sedate. The US is expected to grow by 2.8 percent this year and 2.7 perc ent next year. Japan's growth is projected at 1.2 percent this year and 1 percent next year, while the EU is set to grow 1.9 per cent this year and 2.1 per cent in 2016. Developing countries' average growth is seen as staying at 4.4 percent.
Africa overall is expected to see 4.0 percent growth this year and 4.8 percent growth next year. "A large part of the downward revisions for North Africa and for Africa as a whole is due to Libya, which remains trapped in a civil war," the report says.