People look at a robot during the Smart City Expo World Congress in Barcelona, Spain, Nov. 15, 2016. (Xinhua/Pau Barrena)
A man shows the AgilePol Optical Campus tech at the Huawei stand during the Smart City Expo World Congress in Barcelona, Spain, Nov. 15, 2016. (Xinhua/Pau Barrena)
A Nissan Leaf charges by a solar panel is shown during the Smart City Expo World Congress in Barcelona, Spain, Nov. 15, 2016. (Xinhua/Pau Barrena)
