The refugee crisis that took Europe by surprise last year has posed many challenges for the EU's asylum system, border management and decision-making.
But it is cities that have borne the brunt of the arrival of more than 1 million people in a single year.
Roughly 70 percent of the European population and 75 percent of the continent's jobs are concentrated in cities. Many of the problems governments have to address – from affordable housing and air quality to energy efficiency an...
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