Half or more of the plant and animal species on Earth could disappear within a few decades if current trends hold, according to the scientists interviewed here, who compare the coming losses to the extinction that ended the dinosaurs 65 million years ago. Narrated by Peter Coyote, the film gathers biologists and ecologists including Richard Leakey, Paul Ehrlich, Stuart Pimm, and Gretchen Daly to lay out the mechanics of habitat destruction, climate change, pollution, and invasive species, and how expanding human population and consumption compound each one. It then turns to psychologists, anthropologists, and historians, among them Mary Evelyn Tucker, who examine the cultural myths and behavioral habits that let the crisis build and keep reinforcing it. The film treats the biodiversity collapse as two linked problems: a measurable disaster in ecosystems and a less visible one in how people think and choose. It closes on the argument that decisions made in the next decade will shape the planet's habitability for millions of years afterward.