Luiz Inacio Lula da Silva, president of Brazil, left, greets Hu Jintao, president of China, right, as U.S. President Barack Obama looks on before a Group of 20 nations family photo on day two 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/Andrew Harrer/Pool