What Are The Biggest Threats To The World Economy?

From the migrant crisis to Donald Trump, world events can shape the global economy. So what are the biggest threats to the world economy?

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Global Forecasting Service (gfs.eiu.com)

EU border controls: Schengen scheme on the brink after Amsterdam talks (theguardian.com)
"EU governments have placed a large question mark over the future of Europe's passport-free travel zone, signalling an extension of national border controls within the 26-country Schengen area in response to the immigration crisis."

Russian Intervention in Syrian War Has Sharply Reduced U.S. Options (nytimes.com)
"For months now the United States has insisted there can be no military solution to the Syrian civil war, only a political accord between President Bashar al-Assad and the fractured, divided opposition groups that have been trying to topple him."

Credit Sleuths in China Uncover Bad Debt Dwarfing Official 1.5% (bloomberg.com)
"Corporate investigator Violet Ho never put a lot of faith in the bad loan numbers reported by China's banks."