Britain's Prince Charles helps to plant an Eastern Redbud tree with Nicole Pendergrast, 7, and Kenan Dunson, both from Washington, D.C., at Common Good City Farm in Washington, D.C. on May 3, 2011. UPI/Kevin Dietsch
Prime Minister of Japan Yasuo Fukuda and U.S. President George W. Bush
Prime Minister of Japan Yasuo Fukuda (L) welcomes U.S. President George W. Bush to a tree planting ceremony at the Windsor Hotel Toya Resort and Spa during G8 Summit in Toyako, Japan on July 8, 2008. (UPI Photo/Alex Volgin)
United Nations Secretary-General Kofi Annan, left, and Japanese foreign minister Yohei Kono plant a cherry tree, right, as a symbol of peace in the Peace Bell garden at the United Nations on September 14, 2000 in New York City. rw/mg/Monika Graff UPI
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