Earth Keepers

We meet the young Québécois activist Mikael Rioux who founded Échofête, Quebec's first environmental festival; the iconic Christian de Laet, Ashok Khosla, the charismatic president of Development Alternatives, the largest alternative development NGO in the world; as well as Karl-Henrik Robert, the brilliant Swedish oncologist turned sustainable development guru.

We also get a chance to look at the innovative projects of John Todd, the ecological designer whom MIT hailed as one of the 35 most significant inventors of the 21st century. His companion, Nancy Jack Todd, talks about the origins of their avant-garde "New Alchemy" movement.

We travel to Zurich, the heart of international finance, with the humanist economist Peter Koenig; we meet Marilyn Melhmann, the driving force behind the Global Action Plan; and we listen to a heart-to-heart conversation with Wangari Maathai, the Kenyan Nobel Peace Prize winner and founder of the Green Belt Movement.