A resident returns a public bike at a service site in Chaoyang District in Beijing, capital of China, Feb. 17, 2016. A total of 50,000 bikes that covered 1,730 sites within the city were put into use for residents and tourists by the end of 2015 to buffer the growing motorized traffic congestion and concerns over the environment. More and more people choose low carbon traffic instead of their cars. (Xinhua/Ju Huanzong)