U.S. President Barack Obama looks on as Brazilian President Luiz Inacio Lula da Silva (L) and Chinese President Hu Jintao (R) greet each other during a group photo on the second day of the G-20 summit in Pittsburgh, Pennsylvania on September 25, 2009. G-20 leaders are working on an accord to prevent a repeat of the worst global financial crisis since the Great Depression and ensure a sustained recovery. UPI/Anatoli Zhdanov