“It is with great sadness that the family of Professor Wangari Maathai announces her passing away on 25 September, 2011, at the Nairobi Hospital, after a prolonged and bravely borne struggle with cancer,” the Green Belt Movement said in a statement., external
“Her loved ones were with her at the time.
“Professor Maathai’s departure is untimely and a very great loss to all who knew her – as a mother, relative, co-worker, colleague, role model, and heroine; or who admired her determination to make the world a more peaceful, healthier, and better place.”
The organisation did not provide further details.
Ms Maathai, who was a professor of veterinary anatomy, rose to international fame for campaigns against government-backed forest clearances in Kenya in the late 1980s-90s.
Under the former government of President Daniel Arap Moi, she was arrested several times, and vilified.
In 2008, Ms Maathai was tear-gassed during a protest against the Kenyan president’s plan to increase the number of ministers in the cabinet.
The BBC’s Solomon Mugera met Ms Maathai a number of times.
For those who loved and admired her, she was “Wangari wetu” – our Wangari – he says. But for her enemies, she was derided as “yule mwanamke” – that woman.
In her speech accepting the Nobel prize, Ms Maathai said she hoped her own success would spur other women on to a more active role in the community.
“I hope it will encourage them to raise their voices and take more space for leadership,” she said.
The President of Liberia, Ellen Johnson-Sirleaf, said she was saddened by the news.
“Africa, particularly African women, have lost a champion, a leader, an activist. We’re going to miss her. We’re going to miss the work she’s been doing all these years on the environment, working for women’s rights and women’s participation,” she said.