The United Nations expects the global economy to grow 3 per cent this year and in 2020, slightly below a 3.1 per cent expansion in 2018, it said on Monday.
But urgent and concrete policy action is needed to put the world on track to meet the UN's goals for eradicating poverty by 2030, it said in its annual economic forecast, the "World Economic Situation and Prospects".
"There are plenty of yellow lights flashing and some of those yellow lights are almost certainly likely to turn red over the coming year, with very unpredictable consequences," said Richard Kozul-Wright, head of globalization and development strategies at the UN economic agency UNCTAD.
"Growth is fragile, huge uncertainties remain, risks are looming. We have not broken away from the legacy of the financial crisis of 2008-2009. We are still in a new abnormal."
More than 700 million people live below the extreme poverty line, defined as $1.90 per day in 2011 purchasing power parity, and half of them are in sub-Saharan Africa.
"In Africa, economic growth needs to rise to double-digit levels to reach poverty reduction targets, well beyond growth rates recorded over the last 50 years," the report said.
The global short-term picture appeared "reasonably comfortable", Kozul-Wright said, but many risks had become much more worrying in the past few months, including the end of the "sugar rush" given to the US economy by President Donald Trump's tax cuts.
There were risks associated with slowing growth in Germany and China, the Italian banking system, Britain's exit from the European Union, and the fact that the world economy was still overly burdened with debt a decade after the financial crisis.
"There are very serious threats to economic growth along several fronts - trade, debt, geopolitical, climatic... against a backdrop of deficient leadership at the international level in which trust in traditional institutions, both domestic and international, is draining very quickly," Kozul-Wright said.