Some 99.9 percent of all the species that have ever lived are now extinct. While cataclysmic events on Earth have pruned the tree of life, extinction also opens the door to diversity, carving out room for new species to emerge and thrive. This film explores the causes of the five mass extinctions that have occurred over the life of the planet—and takes us to the sources of extinctions happening today. In doing so, it confronts a frightening notion: Are humans causing the next mass extinction—the sixth in the history of life on Earth? If so, what does evolutionary theory predict for the world we will leave to our descendants?
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