U.N. expects 2017 global growth to rise to 2.7 percent, sees Trump, Brexit challenges

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However it saw uncertainty created by Britain's vote to leave the European Union, and British growth is expected to slump from an estimated 2.0 percent in 2016 to 1.1 percent in 2017 and 1.3 percent in 2018.

Tax policies espoused by U.S. president elect Donald Trump could also have adverse effects on the world economy, said Alfredo Calcagno, head of macroeconomic and development policies at the U.N. economic agency UNCTAD.

"This might generate a deficit in the short run… and that could bring us toward a challenge for the global economy," he told a news conference in Geneva. "The other element of tax reform… is whether this tax system would mean a kind of higher protection for American producers.

Then this would incorporate a huge challenge for the multilateral system and the WTO."

(Reporting by Tom Miles; Editing by Dominic Evans)