German Chancellor Angela Merkel (L) talks with US President Barack Obama (R) during the opening ceremony of the G20 Leaders Summit 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 / NICOLAS ASFOURINICOLAS ASFOURI/AFP/Getty Images

TOPSHOT - A Indian nun showers rose petals as she paya obeisance to a statue of Mother Teresa unveiled at a church in Chennai on September 4, 2016, ahead of the canonisation of Mother Teresa in Rome. Indian Christians are eagerly looking forward to the canonisation of Mother Teresa and churches across the country are holding special masses in her honour. As the Vatican prepares to declare Mother Teresa a saint on September 4, in the Indian city where she rose to fame, claims of medical negligence and financial mismanagement at her care homes threaten to cloud her legacy. / AFP PHOTO / ARUN SANKARARUN SANKAR/AFP/Getty Images

U.S. President Barack Obama (L) and Indian Prime Minister Narendra Modi (R) arrive for the opening ceremony of the G20 Leaders Summit 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 / Mark SchiefelbeinMARK SCHIEFELBEIN/AFP/Getty Images

TOPSHOT - An artist performs during the 8th Annual Whale and Dolphin Festival at Bahia Ballena Beach in Puntarenas, about 230 km southwest of San Jose, on September 2, 2016. The whale watching season in Costa Rica runs from July until October but the peak month to see their migration is September and since the creation of the Festival, economy in the area is thriving. / AFP PHOTO / Ezequiel BECERRAEZEQUIEL BECERRA/AFP/Getty Images

TOPSHOT - A photograph of Mother Teresa is displayed at The Our Lady Queen Church in Siliguri on September 3, 2016, during a special prayer on the eve of her canonisation in Rome. As the Vatican prepares to declare Mother Teresa a saint this Sunday, in the Indian city where she rose to fame, claims of medical negligence and financial mismanagement at her care homes threaten to cloud her legacy. / AFP PHOTO / Diptendu DUTTADIPTENDU DUTTA/AFP/Getty Images

China's President Xi Jinping delivers a speech during the opening ceremony of the G20 Summit 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 / STEPHANE DE SAKUTINSTEPHANE DE SAKUTIN/AFP/Getty Images

China's President Xi Jinping (C) flanked by US President Barack Obama (L) and Russia's President Vladimir Putin (R) delivers a speech during the opening ceremony of the G20 Summit 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 / STEPHANE DE SAKUTINSTEPHANE DE SAKUTIN/AFP/Getty Images

China's President Xi Jinping delivers a speech during the opening ceremony of the G20 Summit 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 / STEPHANE DE SAKUTINSTEPHANE DE SAKUTIN/AFP/Getty Images