Zhang Dejiang (L), a member of the Standing Committee of the Political Bureau of the Communist Party of China (CPC) Central Committee and chairman of the Standing Committee of China's National People's Congress, attends a tree planting activity in Beijing, capital of China, March 29, 2017. China's top leaders Xi Jinping, Zhang Dejiang, Yu Zhengsheng, Liu Yunshan, Wang Qishan and Zhang Gaoli visited east Beijing and planted saplings of different types of trees on Wednesday. (Xinhua/Ma Zhancheng)