The most striking feature of life on Earth is its richness and variety. But research shows that the planet’s biodiversity is seriously threatened with destruction by human activities. From the depths of the oceans to the tops of rainforest canopies, from the African savannas to the soil underfoot, this program hosted by David Attenborough reveals the extent of that living bounty—and the chilling rate at which species are becoming extinct. The research of paleontologist Peter Ward, marine biologist Sylvia Earle, entomologist Terry Erwin, and biologists Sir Robert May, Edward Wilson, and John Lawton is featured. A BBC Production. (50 minutes)