Urth is a film that explores the themes of environmentalism, artificial intelligence, literature, and history. Shot on location at B2, formerly Biosphere 2, the film reverses the fortunes of the experiment, which has survived while the Earth burns. The film features a lone narrator who remains the involuntary captive of the biosphere, tracing her thoughts through audio logs recorded during her final solitary months in the sealed building. Rivers' work is always framed and rarely offers a direct telling of a story, rather his films parallel and re-enact their material. Urth opens with a prologue quoting from The Last Man by Mary Shelley.