The most striking feature of planet Earth is the existence of life, and the most striking feature of life is its richness and variety. From the depths of the oceans to the tops of rainforest canopies, from the African savannahs to the soil under our feet, David Attenborough reveals to us the extent of this living bounty. The latest research show that this variety of life is threatened with destruction by human activities. Will we destroy, as is being predicted, up to 50% of all species on the planet in this present century, and will that tragedy really matter to us, or our children and grandchildren?