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Chinese President Xi Jinping (R) and US President Barack Obama (L) shake hands prior to a meeting at the West Lake State House in Hangzhou on September 3, 2016. The United States and China on September 3 formally joined the Paris climate deal, with US President Barack Obama hailing the accord as the "moment we finally decided to save our planet". World leaders are gathering in Hangzhou for the 11th G20 Leaders Summit from September 4 to 5. / AFP / SAUL LOEB (Photo credit should read SAUL LOEB/AFP/Getty Images)

Chinese President Xi Jinping (R) and US President Barack Obama (L) shake hands prior to a meeting at the West Lake State House in Hangzhou on September 3, 2016. The United States and China on September 3 formally joined the Paris climate deal, with US President Barack Obama hailing the accord as the "moment we finally decided to save our planet". World leaders are gathering in Hangzhou for the 11th G20 Leaders Summit from September 4 to 5. / AFP / SAUL LOEB (Photo credit should read SAUL LOEB/AFP/Getty Images)
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AFP SAUL LOEB