The Earth's climate has suffered successive changes which have determined the number and variety of species in each period. The concept of biodiversity specifically refers to the richness of life in a determined time and space. It's a calculation that measures the variety of species, keeping in mind that those species are capable of reproducing among themselves. There is little difference between insects, plants and mammals because every living being counts... and not only because it's alive but because life also depends on it.
Throughout the history of evolution five great catastrophes have affected the Earth's surface. After them, life had to re-organize itself as of the surviving species. Today, 27,000 species disappear each year, a figure equal or higher than the one which devastated the Earth during the previous extinction processes. Are we facing the Sixth Extinction? Is human being responsible for this ecological disaster? This documentary investigates these questions to offer a track to find answers.
The Sixth Extinction: Meteorite is Not the Greatest Danger of Environmental Change - Online full documentary