keywords: nobel kenyan prize environmentalist maathai
text: Kenyan Green Activist Wins Nobel Peace Prize  OSLO (Reuters) - Kenyan environmentalist Wangari Maathai  became the first African woman to win the Nobel Peace Prize on  Friday, honored for her work planting tens of millions of trees  to save the environment. The award marks a new theme in  interpreting the 1895 will of Sweden's Alfred Nobel, who  founded the prize.