China's President Xi Jinping (C) and G20 leaders pose for family photo in Hangzhou on September 4, 2016. G20 leaders confront a sluggish global economy and the winds of populism as they open annual talks, but the long war in Syria and the South China Sea territorial dispute hang over the summit. / AFP PHOTO / POOL AND AFP PHOTO / STEPHEN CROWLEYSTEPHEN CROWLEY/AFP/Getty Images