1 - 1Oceans: Into the Blue Jan. 13, 2011
1 - 2Deserts: Life in the Furnace Jan. 20, 2011
1 - 3Arctic: Life in the Deep Freeze Jan. 27, 2011
1 - 4Jungles: People of the Trees Feb. 03, 2011
1 - 5Mountains: Life in Thin Air Feb. 10, 2011
1 - 6Grasslands: Roots of Power Feb. 17, 2011
1 - 7Rivers: Friend and Foe Feb. 24, 2011
1 - 8Cities: Surviving the Urban Jungle Mar. 03, 2011