Argentine President Mauricio Macri (L) poses for a picture with United Nations Secretary-General Ban Ki-moon during a ceremony to mark more signatories to the Paris Agreement at the United Nations headquarters in New York, the United States, Sept. 21, 2016. The Paris Agreement on climate change has moved closer towards entry into force, as 31 more countries joined the agreement at a special event here on Wednesday. (Xinhua/Li Muzi)
