Geologist Ian Stewart explain in three stages of natural history the crucial interaction of our very planet's physiology and its unique wildlife. Biological evolution is largely driven bu adaptation to conditions such as climate, soil and irrigation, but biotopes were also shaped by wildlife changing earth's surface and climate significantly, even disregarding human activity.

• BBC
• Iain Stewart
• Norberto Asensio
• Chris Austin
• Katrina Hope
• Daniel Martin
• Jill Pruetz
• Klaus Schmidt
• Jim Spickler