High youth unemployment in Europe and disappointing growth expectations in the emerging world could mean more mass protests like the ones seen in Brazil, Niall Ferguson told CNBC's "Power Lunch" on Tuesday.
"There are two kinds of city that we could see burn this summer," Ferguson said. "The big European cities with Paris at the top of the list look extremely vulnerable. Paris has a greater tradition of urban rioting than almost any city in the world."
Ferguson, a Harvard University professor, said the French economy is bad and "the youth unemployment problem right across Latin Europe is really an explosion waiting to go off."