Emir of Qatar Sheikh Tamim bin Hamad Al-Thani speaks at the 71st session of the United Nations General Assembly at the UN headquarters in New York, on Sept. 20, 2016. The 71st session of the UN General Assembly on Tuesday opened its annual high-level General Debate at the UN headquarters in New York, with a focus on pushing for the world's sustainable development. (Xinhua/Wang Ying)