gettyimagesBRISBANE, AUSTRALIA - NOVEMBER 15: In this handout photo provided by the G20 Australia, US President Obama walks from Queensland State Library to the Gallery of Modern Art on November 15, 2014 in Brisbane, Australia. World leaders have gathered in Brisbane for the annual G20 Summit and are expected to discuss economic growth, free trade and climate change as well as pressing issues including the situation in Ukraine and the Ebola crisis. (Photo by Patrick Hamilton/G20 Australia via Getty Images)