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Chinese President Xi Jinping (C), US President Barack Obama (R) and UN Secretary General Ban Ki-moon (L) shake hands 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 on 03 September 2016. World leaders are gathering in Hangzhou for the 11th G20 Leaders Summit from September 4 to 5. / AFP / POOL / HOW HWEE YOUNG (Photo credit should read HOW HWEE YOUNG/AFP/Getty Images)

Chinese President Xi Jinping (C), US President Barack Obama (R) and UN Secretary General Ban Ki-moon (L) shake hands 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 on 03 September 2016.
World leaders are gathering in Hangzhou for the 11th G20 Leaders Summit from September 4 to 5. / AFP / POOL / HOW HWEE YOUNG        (Photo credit should read HOW HWEE YOUNG/AFP/Getty Images)