Throughout the history of evolution, five great catastrophes have affected the Earth's surface. After them, life had to re-organise itself from the species that survived. Today 27,000 species disappear each year, a number equal or above that which affected the Earth during the previous extinction processes. Are we facing the Sixth Extinction? Is our species responsible for this ecological disaster? This excellent documentary investigates these questions and begins to find the answers. The program clearly explains and illustrates the development of life on earth, evolution, the importance of biodiversity and ecosystems and the nature of adaptation.