Reuters Pictures
Canadian Prime Minister Stephen Harper (C) and his wife Laureen arrive for the G20 Summit at the Pittsburgh International Airport in Coraopolis, Pennsylvania September 24, 2009. Leaders of the Group of 20 countries meet in Pittsburgh on Thursday and Friday, their third gathering since the collapse of investment bank Lehman Brothers a year ago and with their focus now shifting from combating the worst recession since the 1930s to discussing how to prevent it happening again.