Photo taken on Aug. 7, 2015 shows solar water heaters on a rooftop of a house in Lhasa City, capital of southwest China's Tibet Autonomous Region. In recent years, the city of Lhasa implemented many measures to improve the environment. Gas and electric buses and taxis, electric buses and taxis have been put into operation. More than 500 public bicycles were set at the city's streets. Cycling tour and tricycle sightseeing became fashion in and around the city. In people's houses, solar panels and solar cookers are essential for their life. (Xinhua/Jigme Dorje)

　　Photo taken on Aug. 9, 2015 shows people riding bicycles in Lhasa City, capital of southwest China's Tibet Autonomous Region. In recent years, the city of Lhasa implemented many measures to improve the environment. Gas and electric buses and taxis, electric buses and taxis have been put into operation. More than 500 public bicycles were set at the city's streets. Cycling tour and tricycle sightseeing became fashion in and around the city. In people's houses, solar panels and solar cookers are essential for their life. (Xinhua/Zhen Huansong)

　　Photo taken on Aug. 9, 2015 shows people riding bicycles in Lhasa City, capital of southwest China's Tibet Autonomous Region. In recent years, the city of Lhasa implemented many measures to improve the environment. Gas and electric buses and taxis, electric buses and taxis have been put into operation. More than 500 public bicycles were set at the city's streets. Cycling tour and tricycle sightseeing became fashion in and around the city. In people's houses, solar panels and solar cookers are essential for their life. (Xinhua/Jigme Dorje)

　　Photo taken on Aug. 5, 2015 shows public bicycles set in Lhasa City, capital of southwest China's Tibet Autonomous Region. In recent years, the city of Lhasa implemented many measures to improve the environment. Gas and electric buses and taxis, electric buses and taxis have been put into operation. More than 500 public bicycles were set at the city's streets. Cycling tour and tricycle sightseeing became fashion in and around the city. In people's houses, solar panels and solar cookers are essential for their life. (Xinhua/Liu Jinhai)

　　Photo taken on Aug. 7, 2015 shows a man using a solar cooker at home in Lhasa City, capital of southwest China's Tibet Autonomous Region. In recent years, the city of Lhasa implemented many measures to improve the environment. Gas and electric buses and taxis, electric buses and taxis have been put into operation. More than 500 public bicycles were set at the city's streets. Cycling tour and tricycle sightseeing became fashion in and around the city. In people's houses, solar panels and solar cookers are essential for their life. (Xinhua/Jigme Dorje)

　　Photo taken on Aug. 5, 2015 shows people getting on an electric bus in Lhasa City, capital of southwest China's Tibet Autonomous Region. In recent years, the city of Lhasa implemented many measures to improve the environment. Gas and electric buses and taxis, electric buses and taxis have been put into operation. More than 500 public bicycles were set at the city's streets. Cycling tour and tricycle sightseeing became fashion in and around the city. In people's houses, solar panels and solar cookers are essential for their life. (Xinhua/Zhen Huansong)