From the Blu-ray - [Blu-ray version, Widescreen format].
Disc one (ca. 150 min.): Oceans : into the blue ; Deserts : life in the furnace ; Arctic : life in the deep freeze --
Disc 2 (ca. 150 min.). Jungles : people in the trees ; Mountains : life in thin air ; Grasslands : the roots of power --
Disc 3 (ca. 100 min.). Rivers : friend and foe ; Cities : surviving the urban jungle ; Extras.
From the DVD - [Widescreen].
Disc one (ca. 150 min.): Oceans: into the blue
Deserts: life in the furnace
Arctic: life in the deep freeze ; Disc 2 (ca. 150 min.). Jungles: people in the trees
Mountains: life in thin air
Grasslands: the roots of power ; Disc 3 (ca. 100 min.). Rivers: friend and foe
Cities: surviving the urban jungle