See here for a Guardian article on Wangari Maathai
August, 2006, in Nairobi, Kenya: Then Sen. Barack Obama, wife Michelle, daughters Sasha, Malia and other children help plant tree with 2004 Nobel Peace Prize winner Wangari Maathai
President Barack Obama greets Kenyan professor Wangari Maathai in the doorway of the Oval Office, Oct. 5, 2009
The Obama Diary 
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