• 
  David Attenborough

   Himself (3 episodes, 2006)
• 
  Alastair Fothergill

   Himself (2 episodes, 2006)
• 
  Roger Payne

   Himself (3 episodes, 2006)
• 
  Simon Poland

   Himself / ... (3 episodes, 2006)
• 
  Robert May

   Himself (2 episodes, 2006)
• 
  Mark Linfield

   Himself (2 episodes, 2006)
• 
  Chadden Hunter

   Himself (3 episodes, 2006)
• 
  Rowan Williams

   Himself (3 episodes, 2006)

• 
  Huw Cordey

   Himself (3 episodes, 2006)
• 
  Wangari Maathai

   Herself (3 episodes, 2006)
• 
  Tony Juniper

   Himself (2 episodes, 2006)
• 
  Jonathon Porritt

   Himself (3 episodes, 2006)
• 
  James Lovelock

   Himself (3 episodes, 2006)
• 
  Craig Packer

   Himself (2 episodes, 2006)
• 
  E.O. Wilson

   Himself (2 episodes, 2006)

• 
  M. Sanjayan

   Himself (3 episodes, 2006)
• 
  Carlos Quesada

   Himself (2 episodes, 2006)
• 
  Martin Palmer

   Himself (2 episodes, 2006)
• 
  Peyton Knight

   Himself (2 episodes, 2006)
• 
  James Leape

   Himself (3 episodes, 2006)
• 
  Sakana Ole Turede

   Himself (2 episodes, 2006)
• 
  Henry Ndede

   Himself (2 episodes, 2006)
• 
  Jeffrey A. McNeely

   Himself (3 episodes, 2006)
• 
  Nisar Malik

   Himself (2 episodes, 2006)
• 
  Robert Watson

   Himself (2 episodes, 2006)