PITTSBURGH - SEPTEMBER 25:  U.S. President Barack Obama (C) waves after posing for the official group photo at the G-20 as (back-L-R) German Chancellor Angela Merkel, British Prime Minister Gordon Brown, Turkish Prime Minister Recep Tayyip Erdogan, Indian Prime Minister Manmohan Singh, (front) Indonesian President Susilo Bambang Yudhoyono (L), Brazilian President Luiz Inacio Lula da Silva (2nd-L), Chinese President Hujin Tao (2nd-R) and Mexican President Felipe Calderon Hinojosa (R) look on September 25, 2009 in Pittsburgh, Pennsylvania. Heads of state from the world's leading economic powers are meeting for the second day of the G-20 summit held at the David L. Lawrence Convention Center, aimed at promoting economic growth. Getty Images logo Getty Images 1 month ago

PITTSBURGH - SEPTEMBER 25: U.S. President Barack Obama (C) waves after posing for the official group photo at the G-20 as (back-L-R) German Chancellor Angela Merkel, British Prime Minister Gordon Brown, Turkish Prime Minister Recep Tayyip Erdogan, Indian Prime Minister Manmohan Singh, (front) Indonesian President Susilo Bambang Yudhoyono (L), Brazilian President Luiz Inacio Lula da Silva (2nd-L), Chinese President Hujin Tao (2nd-R) and Mexican President Felipe Calderon Hinojosa (R) look on September 25, 2009 in Pittsburgh, Pennsylvania. Heads of state from the world's leading economic powers are meeting for the second day of the G-20 summit held at the David L. Lawrence Convention Center, aimed at promoting economic growth.