Leaders of Group of Eight countries plant trees commemorating the G8 summit in Toyako, northern Japan, in this July 8, 2008 file photo. From left: Then Japanese Prime Minister Yasuo Fukuda, then French President Nicolas Sarkozy, then Russian President Dmitry Medvedev, Canadian Prime Minister Stephen Harper and President of the European Union Jose Manuel Durao Barroso. [Photo/icpress.cn]