writers/directors, Marion Gruner, Christopher Sumpton ; producers, Christopher Sumpton, Robin Benger, Marion Gruner ; produced in association with Arte France, Unité Découverte et Connaissance ; and in association with Canadian Broadcasting Corporation ; Cogent Benger Productions Inc
A production of Clearwater Documentary Inc. ; produced in association with Canadian Broadcasting Corporation ; The Nature of Things ; Directed and written by Tom Radford, Niobe Thompson ; produced by Niobe Thompson