Mass extinction [videorecording] : life at the brink / Tangler Bank Studios in association with Hold Productions and Smithsonian Networks ; written, directed, and produced by Sarah Holt.
Originally broadcast in 2014. Narrator, Jeffrey Wright.
Summary:
It's a mystery on a global scale: five times in Earth's past, life has been nearly extinguished, the vast majority of plants and animals annihilated in a geologic instant. What triggered these dramatic events? And what might they tell us about the fate of our world? Joins scientists around the globe as they unravel the mysteries of two of the most dramatic mass extinction.
This resource is supported by the Institute of Museum and Library Services under the provisions of the Library Services and Technology Act as administered by State Library of Iowa.