Chinese President Xi Jinping (C) shakes hands with US President Barack Obama and UN Secretary General Ban Ki-moon during a joint ratification of the Paris climate change agreement ceremony ahead of the G20 Summit at the West Lake State Guest House in Hangzhou, China, September 3, 2016. REUTERS/How Hwee Young/Pool

Chinese President Xi Jinping (C) shakes hands with US President Barack Obama and UN Secretary General Ban Ki-moon during a joint ratification of the Paris climate change agreement ceremony ahead of the G20 Summit at the West Lake State Guest House in Hangzhou, China, September 3, 2016. REUTERS/How Hwee Young/Pool

Chinese President Xi Jinping (C) shakes hands with US President Barack Obama and UN Secretary General Ban Ki-moon during a joint ratification of the Paris climate change agreement. Photo: Reuters, How Hwee Young

September 3, 2016 10:02 AM (UTC+8)