Watch Independent Lens Season 11 Episode 21 Online

Narrated by Jamie Lee Curtis, "DIRT! The Movie" digs into the fascinating history of this lowly substance, explaining how four billion years of evolution have created the dirt that recycles our water, gives us food, provides us shelter and can be used as a source of medicine, beauty and culture. Destructive methods of agriculture, mining practices and urban development have placed this vital resource in danger.