Kenyan scientist Wangari Maathai, revered for her environmental and human rights work in Africa, has passed away at 71. She was the first African woman to win the Nobel Peace Prize, the first woman in eastern Africa to hold a doctorate, and the visionary behind the Green Belt movement that pays women to plant trees across Kenya. Host Bruce Gellerman and Steve Curwood look back at Living on Earth’s conversations with the visionary woman who helped plant millions of trees.