Taiyuan, the capital of Shanxi province, has long been known as one of China's key heavy industry and energy centers and, as a result, was heavily polluted. But, in recent years, it made a great effort to improve its environment and its ecology and has something to show for all that -- 26 urban and suburban forest parks on a 284-square-kilometer area, which has completely transformed the city into a greener one.(Photo/Xinhua)