Employees take a break in the cafeteria of the sales office at the Yahoo Inc. headquarters in Barcelona, Spain, on Thursday, Feb. 20, 2014. A smart city initiative, which also involves rolling out electric vehicles and bikes and making neighborhood blocks’ energy output self-sufficient, widescale deployment of sensors and quick-response codes to 8,000 points around the city by the end of the year to provide location-based information to anyone with a smartphone, could save Barcelona 3 billion euros in the next decade. Photographer: David Ramos/Bloomberg via Getty Images
